Alright, you guys know that last time when i posted with a trusted idea, it...well... backfired. But here's another idea that'l surely come through (maybe) - Trusted to change /weather sun or /weather rain.
Now about abuse of commands, this command is used sometimes vaguely and it's highly likely anyone would pull any stunts (espically with the weather command, i mean, seriously, you could do better) before someone gets in trouble.
Now for the pros, it's preety simple: no rain, no baddies, no lag, everyone gets off happy.
Cons, none, really.