I actually discussed this possibility with one of our devs. It's possible, but it has some problems.
A. We'd literally need two versions of almost every game
B. Updating it would be a giant burden
C. It would just slow down progress on other projects like freebuild even more
D. I don't think our current server capacity could manage that big of an addition; we'd need to upgrade again for that.
In short, it's very unlikely that we'll be doing this. For now, we're going to wait and see if the pvp situation is really as bad as everyone's making it out to be (because honestly, I don't think it's so horrible as it is, just needs some getting used to)
If the new pvp is really breaking the games that badly, we'll come up with some solution, but for now, it seems fine.