Could work, it\'s implemented in other games. You would be able to go PK, and NEVER GO BACK to being Non-PK on the charachter. There would also be no level limitation, a huge powerful player should be able to attack small defenseless PKers. This would prevent a bunch of little newbies from running around PK. It would also discourage PKing, except for the best of the players who have nothing better to do.