I like the friendly kick option, or at least need the majority of the ENTIRE group - as in all of the opposing team and at least 2 of your own - to keep retards (pronounced reh-tards) from abusing.
I would sure as **** hands down kick a cheater if he was on my team, the assholes steal the kills I hustle hard for before I get a chance to get them.
Edit: also as aldar said before me - admins who play are most certainly kicking high level players. I believe I've had it happen to me three times now after rampaging through an enemy team. It's obnoxious, especially when one calls you a cheater right before mysteriously getting disconnected.