You should just read the game mode FAQ in Modification Discussion so that you know how they work.
Well, I did read that topic. I just figured that Rotondo was talking about packaging gamemodes with pure defaults seeing as thats all he used as examples, and because I can think if no way a .txt file can grant access to addons only I have, I assumed I needed the contents of those addons in the Gamemode file.
I also took a peek into other Gamemode files as a refference and saw textures and seperate folders with addon contents in them further convincing me.
By what I'm being told, I can just put my addon file names into the Addon list .txt accordingly and that's it?
If so, I am very impressed. If not, I'm missing something important..