Gamejoin Problems.

[MegaScientifical]

Darklight had something like this on his server for his CityRP that if you didn't send him a command on joining or something it would kick you for not having his scripts.

Oh ya! I remember that. God, that's a good idea. Your add-on would require that they send a command on joining any server. If the client never sends, they obviously don't have the add-on, so it blocks them out.

[Ad Bot]

[Space Guy]

You really shouldn't kick people for not downloading your mods. Make it properly and use substitute things like bottomprints or /commands for players without them - if they want the convenience they can download it but let them at least try the server before being forced to install your random things.