I dont know about any settings that allow that, but you could always place an invisible npc near the zoneins that triggers a quest by proximity that will set a PC to pvp on.
Might also want it to reset their bind point to within the zone, so they can be reset to pvp off by leaving via the same type quest. Else you would need code that catches them when they die to reset their flags.
Not much help, but I hope it gets your gears turning in a useful direction if noone else knows of any flags/ triggers.
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