Honestly, I've never had much trouble with godmodders/trolls simply because my default reaction is to act like they aren't there and carry on. If it gets bad, I give them one warning, then block them if they're still at it. No fuss, no rage, and the RP goes on. It's actually surprising how many stop if you just say you'll block them.
Granted, if they just don't know what they're doing, it's different, but most are just out to get a reaction.