Uhm just to be sure, you mean PvP as in player vs player, which means players can attack eachother? Not mistaken with PvE (player vs environment).

If so then no thanks! Only a masochistic mind would even think of such a thing! :P I mean, the nether is already lethal. I had a sneak peak in the nether the other day (jack showed me) and there were tons of ghasts flying around! :O I even want to ask if its possible to reduce the amount of ghast with a mod orso. ;)