Exit all copies of Blockland.
Edit My Documents/Blockland/config/server/ADD_ON_LIST.cs
Save
Run dedicated server
If this doesn't work for you, you are either doing it wrong or have installed some add-on that subverts normal add-on loading.
Exit all copies of Blockland.

Edit My Documents/Blockland/config/server/ADD_ON_LIST.cs
$AddOn__Brick_18Degree = "1";
$AddOn__Brick_1RandomPack = "1";
$AddOn__Brick_2x2FRoundPrint = "1";
$AddOn__Brick_Arch = "1";
$AddOn__Brick_Checkpoint = "-1";
$AddOn__Brick_Corner = "1";
$AddOn__Brick_DecorativeBlocks = "1";
$AddOn__Brick_ExtraRamps = "1";
$AddOn__Brick_Fence = "1";
$AddOn__Brick_GrillPlate = "1";
$AddOn__Brick_Halloween = "1";
$AddOn__Brick_InvertedCorners = "1";
$AddOn__Brick_Large_Cubes = "1";
$AddOn__Brick_NewWater = "-1";
$AddOn__Brick_Pole = "1";
$AddOn__Brick_PrintCubes = "1";
$AddOn__Brick_PrintPlates = "1";
$AddOn__Brick_Road_Plates = "1";
$AddOn__Brick_Round_Corners = "1";
$AddOn__Brick_SmallVehicleSpawn = "-1";
$AddOn__Brick_Spike = "1";
$AddOn__Brick_Tiles = "1";
$AddOn__Brick_TinyWindows = "1";
$AddOn__Brick_Treasure_Chest = "1";
$AddOn__Brick_V15 = "1";
$AddOn__Brick_Wedge = "1";
$AddOn__Brick_Window = "1";
$AddOn__Brick_Window_Prints = "-1";
$AddOn__Content_DaleksDoors = "1";
$AddOn__Content_Kyle = "1";
$AddOn__Content_PackerDoors = "1";
$AddOn__Content_Phydeoux = "1";
$AddOn__Content_PhydeouxMedieval = "1";
$AddOn__Content_Safe = "1";
$AddOn__Content_ZonearkWindows = "1";
$AddOn__Emote_Alarm = "1";
$AddOn__Emote_Confusion = "1";
$AddOn__Emote_Hate = "1";
$AddOn__Emote_Love = "1";
$AddOn__Event_addItem = "1";
$AddOn__Event_Bots = "1";
$AddOn__Event_Camera = "1";
$AddOn__Event_ChangePlayerLight = "1";
$AddOn__Event_ItemSaving = "1";
$AddOn__Event_MessageBoxOK = "1";
$AddOn__Event_modColor = "1";
$AddOn__Event_Passwords = "1";
$AddOn__Event_PromptEvents = "1";
$AddOn__Event_RemoveItem = "1";
$AddOn__Event_SetNameColor = "1";
$AddOn__Event_setPlayerTransform = "1";
$AddOn__Gamemode_CityRPG = "1";
$AddOn__Item_Camcorder = "1";
$AddOn__Item_GasCan = "1";
$AddOn__Item_Key = "1";
$AddOn__Item_Key_dUMBELLS = "1";
$AddOn__Item_Keycard = "1";
$AddOn__Item_Medpack = "1";
$AddOn__Item_Microphone = "1";
$AddOn__Item_NightVision = "1";
$AddOn__Item_parachute = "1";
$AddOn__Item_Shield = "1";
$AddOn__Item_Skis = "-1";
$AddOn__JVS_Bushido1 = "1";
$AddOn__JVS_Content = "1";
$AddOn__JVS_DoorsPack-1 = "1";
$AddOn__JVS_DoorsPack1 = "1";
$AddOn__JVS_DoorsPack2 = "1";
$AddOn__JVS_PlungerSwitch = "1";
$AddOn__JVS_SwitchesPack1 = "1";
$AddOn__JVS_SwitchesPack2 = "1";
$AddOn__JVS_TheLegendsDoors = "1";
$AddOn__Light_Animated = "1";
$AddOn__Light_Basic = "1";
$AddOn__Light_Candle = "1";
$AddOn__Light_Cityz = "1";
$AddOn__Light_Dim = "1";
$AddOn__Light_Small = "1";
$AddOn__Lights_DrenDran = "1";
$AddOn__Mask_NVGs = "1";
$AddOn__Particle_Basic = "1";
$AddOn__Particle_Candle = "1";
$AddOn__Particle_Colorfire = "1";
$AddOn__Particle_FX_Cans = "1";
$AddOn__Particle_Grass = "1";
$AddOn__Particle_Player = "1";
$AddOn__Particle_Smoke = "1";
$AddOn__Particle_Tools = "1";
$AddOn__Player_Cow = "1";
$AddOn__Player_Fuel_Jet = "1";
$AddOn__Player_Jump_Jet = "1";
$AddOn__Player_Leap_Jet = "1";
$AddOn__Player_No_Jet = "1";
$AddOn__Player_Quake = "-1";
$AddOn__Print_1x1_Blockffiti = "1";
$AddOn__Print_1x1_Brokenglass = "1";
$AddOn__Print_1x1_Caution = "1";
$AddOn__Print_1x1_Checkered = "1";
$AddOn__Print_1x1_electronicNumbers = "1";
$AddOn__Print_1x1_LionKing = "1";
$AddOn__Print_1x1_MoviePosters = "1";
$AddOn__Print_1x1_NoSymbolSigns = "1";
$AddOn__Print_1x1_Posters = "1";
$AddOn__Print_1x1_Skatelogos = "1";
$AddOn__Print_1x1_SpeedLimitSigns = "1";
$AddOn__Print_1x1_StairSymbolSigns = "1";
$AddOn__Print_1x1_TrafficSigns-11 = "1";
$AddOn__Print_1x1_VehicleSymbolSigns = "1";
$AddOn__Print_1x1f_Caution = "1";
$AddOn__Print_1x2f_BLPRemote = "1";
$AddOn__Print_1x2f_Default = "1";
$AddOn__Print_1x2f_premiumtiles = "1";
$AddOn__Print_2x2f_Books = "1";
$AddOn__Print_2x2f_Bricktendo_BS = "1";
$AddOn__Print_2x2f_Crate = "1";
$AddOn__Print_2x2f_Default = "1";
$AddOn__Print_2x2f_DN3D = "1";
$AddOn__Print_2x2F_JG_CratesPlus = "1";
$AddOn__Print_2x2f_kitchentile = "1";
$AddOn__Print_2x2f_Magazine = "1";
$AddOn__Print_2x2F_Minecraft = "1";
$AddOn__Print_2x2f_Paper = "1";
$AddOn__Print_2x2f_Papers = "1";
$AddOn__Print_2x2f_premiumtiles = "1";
$AddOn__Print_2x2f_Record = "1";
$AddOn__Print_2x2f_WallsFloors = "1";
$AddOn__Print_2x2f_Wanteds = "1";
$AddOn__Print_2x2fl_Default = "1";
$AddOn__Print_2x2l_Default = "1";
$AddOn__Print_2x2r_Default = "1";
$AddOn__Print_2x2r_Gilneas = "1";
$AddOn__Print_2x2r_Monitor3 = "1";
$AddOn__Print_2x2r_PCScreens = "1";
$AddOn__Print_Letters_Default = "1";
$AddOn__Projectile_GravityRocket = "-1";
$AddOn__Projectile_Pinball = "1";
$AddOn__Projectile_Pong = "1";
$AddOn__Projectile_Radio_Wave = "1";
$AddOn__Props_Household = "1";
$AddOn__RustyMunk_ExtMakHats = "1";
$AddOn__RustyMunk_ExtMakPackTwo = "1";
$AddOn__RustyMunk_ExtPandan = "1";
$AddOn__RustyMunk_HatModPlus = "1";
$AddOn__Script_AdvanceLight = "1";
$AddOn__Script_ClearSpam = "-1";
$AddOn__Script_ClickPush = "1";
$AddOn__Script_Hammer = "1";
$AddOn__Script_KeepTools = "1";
$AddOn__Script_Me = "1";
$AddOn__Script_Moderator = "1";
$AddOn__Script_Mute = "1";
$AddOn__Script_No_Clan_Tags = "1";
$AddOn__Script_Player_Persistence = "1";
$AddOn__Script_RGBOrb = "1";
$AddOn__Script_ServerRules = "1";
$AddOn__Script_VehicleStereo = "1";
$AddOn__Script_Wrench = "1";
$AddOn__server_banlimit = "1";
$AddOn__Server_Boundary = "1";
$AddOn__Server_CellPhones = "1";
$AddOn__Server_FlashlightEnergy = "1";
$AddOn__Server_GamePreferences = "1";
$AddOn__Server_GasMod = "1";
$AddOn__Server_HideKills = "1";
$AddOn__Server_Hijacking = "1";
$AddOn__Server_ServerVoting = "1";
$AddOn__Server_WeaponNames = "1";
$AddOn__Sound_Bedroom_Sounds = "1";
$AddOn__Sound_Beeps = "1";
$AddOn__Sound_Cash_Register = "1";
$AddOn__Sound_Phone = "1";
$AddOn__Sound_Synth4 = "1";
$AddOn__System_2DMusic = "1";
$AddOn__System_PropSys = "1";
$AddOn__System_ReturnToBlockland = 1;
$AddOn__Tool_Duplicator = "1";
$AddOn__Tool_Fill_Can = "1";
$AddOn__Tool_RPG = "1";
$AddOn__Vehicle_Ball = "-1";
$AddOn__Vehicle_Basic_Scooter = "1";
$AddOn__Vehicle_Basic_Skateboard = "1";
$AddOn__Vehicle_Bengs = "1";
$AddOn__Vehicle_Blocko_Car = "1";
$AddOn__Vehicle_BlockoSedan = "1";
$AddOn__Vehicle_Blockstang = "1";
$AddOn__Vehicle_BumperCar2G = "1";
$AddOn__Vehicle_Buses = "1";
$AddOn__Vehicle_Chair = "1";
$AddOn__Vehicle_Converti = "1";
$AddOn__Vehicle_DeliveryVan = "1";
$AddOn__Vehicle_DKW = "1";
$AddOn__Vehicle_Firetruck = "1";
$AddOn__Vehicle_Flying_Wheeled_Jeep = "-1";
$AddOn__Vehicle_Forklift = "1";
$AddOn__Vehicle_Horse = "-1";
$AddOn__Vehicle_Jeep = "-1";
$AddOn__Vehicle_Magic_Carpet = "-1";
$AddOn__Vehicle_Microbus = "1";
$AddOn__Vehicle_Modernhatch = "1";
$AddOn__Vehicle_Motorbike = "1";
$AddOn__Vehicle_MotorcyclePack = "1";
$AddOn__Vehicle_MuscleCars = "1";
$AddOn__Vehicle_PassengerJet = "1";
$AddOn__Vehicle_Pirate_Cannon = "-1";
$AddOn__Vehicle_PrivateJet = "1";
$AddOn__Vehicle_Roadster = "-1";
$AddOn__Vehicle_Rowboat = "-1";
$AddOn__Vehicle_Scooter = "1";
$AddOn__Vehicle_Segway = "1";
$AddOn__Vehicle_SUVPickup = "1";
$AddOn__Vehicle_Tank = "1";
$AddOn__Vehicle_TinyCar = "1";
$AddOn__Vehicle_Tricycle = "1";
$AddOn__Vehicle_Turismo = "1";
$AddOn__Weapon_BNailgun = "1";
$AddOn__Weapon_Bow = "1";
$AddOn__Weapon_BugSpray = "1";
$AddOn__Weapon_Gun = "1";
$AddOn__Weapon_Guns_Akimbo = "1";
$AddOn__Weapon_Horse_Ray = "-1";
$AddOn__Weapon_Mac1-1 = "1";
$AddOn__Weapon_Molotov = "1";
$AddOn__Weapon_Push_Broom = "-1";
$AddOn__Weapon_Rocket_Launcher = "-1";
$AddOn__Weapon_SFRevolver = "1";
$AddOn__Weapon_Shotgun = "1";
$AddOn__Weapon_Slingshot = "1";
$AddOn__Weapon_Sniper_Rifle = "1";
$AddOn__Weapon_Spear = "-1";
$AddOn__Weapon_Sword = "-1";
$AddOn__Weapon_Taser = "1";
$AddOn__Weapon_TF2MedicPack = "1";
$AddOn__Weapon_TommyGun = "1";
Save

Run dedicated server

RESULTS:

Horse Ray was disabled in Server.cs

So was sword and spear.

Roadster,rowboat,tank and tank turret were all disabled.

So was ball.
If this doesn't work for you, you are either doing it wrong or have installed some add-on that subverts normal add-on loading.
I have just showd you i did EXACTLY as you said. and my addons dont force these addons:
BRICKS
----------------------------------------------------------------------------------------------------------
Brick_18Degree, Brick_1RandomPack, Brick_2x2FRoundPrint, Brick_Corner, Brick_DecorativeBlocks, Brick_ExtraRamps, Brick_Fence, Brick_GrillPlate, Brick_InvertedCorners, Brick_NewWater, Brick_Pole, Brick_PrintCubes, Brick_PrintPlates, Brick_Road_Plates, Brick_Round_Corners, Brick_SmallVehicleSpawn, Brick_Spike, Brick_Tiles, Brick_TinyWindows, Brick_Wedge, Brick_Window, Brick_Window_Prints
----------------------------------------------------------------------------------------------------------
CONTENT
-----------------------------------------------------------------------------------------------------------------------------------------------
Content_DaleksDoors, Content_Kyle, Content_PackerDoors, Content_Phydeoux, Content_PhydeouxMedieval, Content_Safe, Content_ZonearkWindows
----------------------------------------------------------------------------------------------------------
EVENTS
----------------------------------------------------------------------------------------------------------
Event_addItem, Event_Bots, Event_Camera, Event_ChangePlayerLight, Event_ItemSaving, Event_MessageBoxOK, Event_modColor, Event_Passwords, Event_PromptEvents, Event_RemoveItem, Event_SetNameColor, Event_setPlayerTransform
----------------------------------------------------------------------------------------------------------
GAMEMODES
----------------------------------------------------------------------------------------------------------
Gamemode_CityRPG
-FORCED ADDONS-
Weapon_Mac10, Weapon_BugSpray, Weapon_TF2MedicPack, Weapon_SFRevolver", Weapon_Bow, Weapon_TommyGun, Weapon_RevolversDuo, Weapon_Slingshot, Weapon_BNailgun, Weapon_Molotov, Weapon_Bow, Item_Shield, Item_GasCan, Item_parachute
----------------------------------------------------------------------------------------------------------
ITEMS
----------------------------------------------------------------------------------------------------------
Item_Camcorder, Item_GasCan, Item_Key, Item_Key_dUMBELLS, Item_Keycard, Item_Medpack, Item_Microphone, Item_NightVision, Item_parachute, Item_Shield
----------------------------------------------------------------------------------------------------------
JVS
----------------------------------------------------------------------------------------------------------
JVS_Bushido1, JVS_Content, JVS_DoorsPack0, JVS_DoorsPack1, JVS_DoorsPack2, JVS_PlungerSwitch, JVS_SwitchesPack1, JVS_SwitchesPack2, JVS_TheLegendsDoors
----------------------------------------------------------------------------------------------------------
LIGHTS
----------------------------------------------------------------------------------------------------------
Light_Candle, Light_Cityz, Light_Dim, Light_Small, Lights_DrenDran
----------------------------------------------------------------------------------------------------------
MAPS IM USING
----------------------------------------------------------------------------------------------------------
Dedicated server uses Map_Skylands, Map_AdjustablePlate, and Map_Slate
----------------------------------------------------------------------------------------------------------
MASKS
----------------------------------------------------------------------------------------------------------Mask_NVGs
----------------------------------------------------------------------------------------------------------
PARTICLES
-----------------------------------------------------------------------------------------------------------------------------------------------
Particle_Candle, Particle_Colorfire, Particle_Smoke
----------------------------------------------------------------------------------------------------------
PLAYERS
----------------------------------------------------------------------------------------------------------
Player_Cow
----------------------------------------------------------------------------------------------------------
-PRINTS SHOULDENT MATER-
PROPS
----------------------------------------------------------------------------------------------------------
Props_Household
----------------------------------------------------------------------------------------------------------
RUSTYMUNK
-----------------------------------------------------------------------------------------------------------------------------------------------
RustyMunk_ExtMakHats, RustyMunk_ExtMakPackTwo, RustyMunk_ExtPandan, RustyMunk_HatModPlus
----------------------------------------------------------------------------------------------------------
SCRIPT
----------------------------------------------------------------------------------------------------------Script_AdvanceLight, Script_ClearSpam, Script_ClickPush, Script_Hammer, Script_KeepTools
Script_Me, Script_Moderator, Script_Mute, Script_No_Clan_Tags, Script_Player_Persistence, Script_RGBOrb, Script_ServerRules, Script_VehicleStereo, ript_Wrench
----------------------------------------------------------------------------------------------------------
SERVER
-----------------------------------------------------------------------------------------------------------------------------------------------
server_banlimit, Server_Boundary, Server_CellPhones, Server_FlashlightEnergy, Server_GamePreferences, Server_GasMod, Server_HideKills, Server_Hijacking, Server_ServerVoting, Server_WeaponNames
----------------------------------------------------------------------------------------------------------
SOUND
----------------------------------------------------------------------------------------------------------Sound_Bedroom_Sounds, Sound_Cash_Register
----------------------------------------------------------------------------------------------------------
SYSTEM
----------------------------------------------------------------------------------------------------------System_2DMusic, System_PropSys, System_ReturnToBlockland
----------------------------------------------------------------------------------------------------------
TOOLS
----------------------------------------------------------------------------------------------------------Tool_Duplicator, Tool_Fill_Can, Tool_RPG
----------------------------------------------------------------------------------------------------------
VEHICLES
----------------------------------------------------------------------------------------------------------
Vehicle_Basic_Scooter, Vehicle_Basic_Skateboard, Vehicle_Bengs, Vehicle_Blocko_Car, Vehicle_BlockoSedan, Vehicle_Blockstang, Vehicle_BumperCar2G, Vehicle_Buses, Vehicle_Chair, Vehicle_Converti, Vehicle_DeliveryVan, Vehicle_DKW, Vehicle_Firetruck, Vehicle_Forklift, Vehicle_Microbus, Vehicle_Modernhatch, Vehicle_Motorbike, Vehicle_MotorcyclePack, Vehicle_MuscleCars, Vehicle_PassengerJet, Vehicle_PrivateJet,Vehicle_Roadster, Vehicle_Scooter, Vehicle_Segway, Vehicle_SUVPickup, Vehicle_TinyCar, Vehicle_Tricycle, Vehicle_Turismo
----------------------------------------------------------------------------------------------------------
WEAPONS
----------------------------------------------------------------------------------------------------------
Weapon_BNailgun, Weapon_Bow, Weapon_BugSpray, Weapon_Gun, Weapon_Guns_Akimbo, Weapon_Horse_Ray, Weapon_Mac10, Weapon_Molotov, Weapon_Push_Broom, Weapon_Rocket_Launcher, Weapon_SFRevolver, Weapon_Shotgun, Weapon_Slingshot, Weapon_Sniper_Rifle, Weapon_Spear, Weapon_Sword, Weapon_Taser, Weapon_TF2MedicPack, Weapon_TommyGun
----------------------------------------------------------------------------------------------------------
END ADD-ON LIST
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