semi-spoiler:Hey, ekb, you know there's a game specifically designed to handle exactly what you're going for, right
I liked Classroom Deathmatch. I also liked Panty Explosion and Battle Royale. I didn't like the rules system - it just wasn't as collaborative as I'd like. Rarely do you eliminate a peer on your own: you bring friends and have a boot party...
CD also operates at an individual level whereas what I'm doing is at a squad level, to use some of the wargaming jargon. Works better at keeping everyone at the table while still allowing for the sex, sadism & snobbery to get Truly Brutal(TM).
I also enjoy the way that extended actions are organized in Reign... because it takes a while to kill a cheerleader, much less the whole mess of them.