Balancing the impact of PVP upon the game
Here is a suggestion not directly related to PVP, but inspired by the impact of PVP upon the overall game:
Offer speed passes for players to earn/achieve/buy that when used will complete missions that we have already previously completed manually with 3 skulls. This will help take the grind out of the game. 50 missions to use all your troopers is a lot in one day even on autoplay sometimes (not to mention LOL dungeon and soon BNW farming). I'm already finding it difficult to keep up some days with the addition of PVP. Not only that the game can begin to feel repetitive and almost like work and this helps keep things in the fun zone (where games should be!).
Please look at DC Legends to see a model for this. Perhaps one could't earn enough to go through ALL 50 missions in a day but even cutting down a portion would be nice and would add another award/incentive (perhaps added to the daily gifts to stretch the entire month).
Name suggestion: "Speed of Light Pass"