/cars lets you control what cars are allowed on the certain server. i.e /cars FXO+XRT+MRT ot /cars LRF+TBO
/ban USERNAME NUMBER < can prove useful :P for kick, just put kick instead of ban.
/laps NUMBER < obvious really.....
/track TRACK CODE < this one proves a little tricky, you have to put in the track code. i.e BL1 is blackwood gp, ummmm, thats all i know really :S