I wonder if it might be easier to just arrange pvp amongst people wishing to participate. One of the challenges with any system of pvp at the moment is that it is hard to identify people at a distance because name tags do not render until you are almost face-to-face. Perhaps, if some people want an ongoing struggle between factions, they should wear side-specific clothing to identify themselves. If you wish to participate in the pvp, you have to be wearing the appropriate article of clothing. As headgear is, as far as I know, the only customizable clothing currently in the game, perhaps each faction should pick a hat. If you want to do North vs. South, perhaps those in the south faction should wear cowboy hats when participating and those in the north wear baseball caps. Players not wearing a hat or those wearing skullcaps or mining helmets would be deemed not participating in the conflict (except obviously for the pvp rules in Dier/Grave/drop sites).