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I don't think PvE and PvP mix too well and games should be designed around one or the other but at the same time if a PvE game decides to add some PvP content as an alternative activity i find things like scenarios and battlegrounds a bit pointless. So i had the idea - which may be already be done somewhere - of duplicate zones.
Say you have a border zone between two factions and when you cross the border line you choose to enter the PvE version or the PvP version. They'd use the same zone data but the PvP one wouldn't have the quests etc instead there'd be a bunch of control points and NPC guards etc. There'd be a lot of NPC activity as well i.e. launching invasions at the various control points, as tweaking the number of faction NPCs would be one way of balancing the numbers of enemy players in the zone.
If the PvE game was dynamic in the sense that individual zones had several states they could switch between e.g. a fort in the middle of the PvE zone could have merchants/guards from either of the two enemy factions then the flag could be set by which side was winning in the PvP zone.
Anyone know any games that do that?