That snow stuff was in an old South Park game for N64...
Good days, it was only one of two games that I know of where urine could be used as a weapon (Or weapon enhancer).

What I would like to see is some simple chat commands like:
/whisper or /w <user> <message>
/kick or /k <user> <reason>
/ban or /b <user> <time limit> <reason>

(The good battle.net stuff)

Or even a say mode which simulates the command in console, I've always wanted that...*is lazy*

When you do add a ban system, don't use the HL2 ban system because you can't put in a reason why they po'd you. Just integrate auto-kick. (At least I don't think you can give a reason)