Personally... I think votekicking/banning should be restricted to once or twice a day per person.... That way you will only kick someone who really needs it. I mean for goodness sakes, 2 kicks and 2 bans is more than plenty for one day. I haven't gone over that amount in recent memory, and I don't even have a time limit on me. Granted I can do more than just kick and ban.
How about instead, add a new vote, /moneyrounders or something similar. Where it starts a vote identical to the vote-kick/ban system, but instead of kicking someone if it succeeds, it starts a 30 second timer which at the end of it, it kills everyone in game.
Much less abuse-able, much more effective, and much less extreme, than reducing the timer.