The clan contracting could make for some nice sidequests, but there would have to be some story arcs to hold the quests together. (It will also drive me crazy should the game ever actually be released, since it will make gathering every item a real pain [it'd be totally impossible without trading], but, what the hey.)

Not sure I'm gonna go with the POW gathering though. I've already got the wanted system and the jail system, and I don't want to overcomplicate things.