I think it would enhance the game overall if PVP was enabled. There would have to be a way for people who don't want to fight to turn off PVP, otherwise it would just be another tool for trolls. There should be a way for players to see who has PVP turned on and who doesn't. Maybe it should be that you can only fight another player if both of you agree on fighting.
Of course, I know that nothing can be done until Kovu returns. Just an idea. Whatcha guys think?