Ok, in an effort to protect players who simply wish to live a peaceful lifestyle and prosper in their trade, yet still allow warlike players to fight amongst themselves, I propose a system for a PvP toggle:
You would gain the PvP Toggle skill in adventure upon purchasing your first black arts skill.
The toggle could only be changed every so many in-game days. This time limit could be affected by a belief slider. For instance at full martial you could change your PvP toggle every 8 hours in-game and at full peaceful you could only change it every 3 in-game days (similar to the change/tradition affect on slider adjustments)
This way a peaceful player could just keep their PvP toggle off and go about their business without fear of total annihilation by another player. Then if the peaceful player decided he wanted to participate in PvP he could switch his toggle on, but this would leave him vulnerable to any PvP actions for 3 days until he was able to toggle it off again so it would be very risky but at least it would be his own personal action that ultimately led to his demise if he is attacked in this time, rather than the mere whim of a PvP-oriented player as it is now.
The martial player would be able to change his toggle much more often, allowing him to create smaller windows of opportunity such that 2 martial players at war would need to make calculated attacks when the other party is vulnerable, adding a greater necessity for organization and clever planning.
Edit: The PvP toggle should apply to the player's character and everything covered by his or her personal claim. The lawspeaker and/or chieftain of a village should have the ability to activate a similar toggle for village claim. Perhaps it could be located in the government menu and cost a large amount of Authority.