A word of warning for anyone running a tournament with Poker Mavens. If you have rebuys enabled and someone goes to click on it after busting out, they'll need to have enough in their account too cover the rebuy.
If they don't, they're automatically booted with no 2nd chance. On my game, I'm letting everyone go negative in their balance (it's a system option) so that they don't mistakenly lose their rebuy.
The only other option I see is to ensure they don't hit rebuy until you've put more money in their account to cover it. You only get like 60 seconds too...
Then again, they could just buy in for more than the tournament costs, assuming they'll need to rebuy.