Plutonium

I'm interested in doing the exactly same thing and I haven't figured it out yet. I found some GSC scripts that force every player to have a specific class one spawned, without any option to choose.
Plus I can't disable custom classes in server: when I set the option in dedicated.cfg ("//scr_disable_cac 1" to "scr_disable_cac 1") nothing happens, even if other settings (like server password) work fine.