If someone is abusing JJ2+, that's not JJ2+'s fault, it's the person who's abusing it. Just don't play on the server. Putting a time limit on it annoys people who legitimately use the feature while being but a minor inconvenience to griefers.

Anyway, I don't play JJ2 much anymore (my hard drive with my JJ2 directory on it got fried), but I figure a /scramble command (if it doesn't exist already) could be useful. /scramble would automatically set all the players in random teams, ensuring every team is even (in case one team is stacked, e.g. Vegito, Blur, and R3p versus three random Polish players).