Well I not sure if I am posting this right. Saw that Sythe was developing a MMORPG and came up with an idea. Well I have played a few games where you could "Party up" with each other to fight monsters for experience. What I mean is you get shared experience and loot for killing monsters in your "Party". I am basing this mostly of the game Knights OnLine and the party system is great on there. This could work with pking. If you pk in groups you could share the loot ? (not sure if you pk someone it will drop items) or points for beating someone. If your in a party its obvious you will get less exp from monsters unlike soloing the monsters. Sorry if its bad or something I thought its a good idea from Knight OnLine you could change it up and add different effects or something to the system. But that is my idea hope you like it. Sorry if it's posted already.
EDIT: I guess I forgot the poll, so if a mod could add that or something that would be nice thanks.