For the purposes of this experiment, lets put aside the social and friendship breaking issues that come with PVP and look at this from a strictly game mechanics standpoint. "I would never allow PVP at my table" isn't the answer I'm looking for.
How would you handle destiny point flips when two players go to war? As both would draw from the PC pool and not the GM pool, the points could be drained in pretty short order. There's not really any way for the GM to send them back the other way.
There's a couple of angles I thought of off the top of my head. The first is declare the points off limits to all. But that cuts the legs out from using some talents, dark side pips or signature abilities, so I'm not a fan of that. The other avenue could be take the current pool, divide equally into 2 so both have the same pile in front of them, and any flips hop over to the other PC. Problem is that model breaks down if you have more than two PCs throwing down.
Any observations from a table where PVP does happen? Any brilliant ideas from the peanut gallery?