Ouch! My ears! Please don't shout so loud, thank you.
OK, if you're running a DEBUG build of the game, open the console, and try "debug" then the TAB key (if I'm remembering this right) without pressing Enter. If memory serves, the TAB key uses the auto-completion for commands, and you should then get a list of debug commands.
One of those is to kill a whole team (there's also a stun team option).
Just make sure you kill the right team, not your own guys.