I think it depends on your motives. If you're trying to balance teams, absolutely, as long as it doesn't kill the player in the process (ie; they're already dead).
I don't think you can force someone to play on a specific team, so if they say "I wanna play on CTs for this map", you should respect their wishes and try to teamchange someone else.

Or just say "lols suck it, play this team or get kicked!".


I miss lolsbian. :(