You might have to work this out a bit, but the general premise is already in tf2, I suggest that A) friendly fire is enabled on the winning team being announced at the end of the game, this will make it a bit more interesting (idea from gmod jailbreak) and B) and this is just a suggestion, it might not work but... maybe when you die, you become a ghost? there is an addcond (addcond 77 I believe) that does this, and removecond (77?) to remove it. it would be cool to still be able to interact with people, to some extent. (idea from gmod deathrun).