I was thinking (this might already be planned, but who knows) when you register yourself you should choose a side.
Axis or Allies.
Even though you choose axis or allies, you can still play both sides, but you get access to a private sub-forum. This was players can gather and post tactics that the other side can't see.
To stop people from deleting their profile and switching sides you'd have to do something along the lines of making it take X amount of time for someone to get accepted into the private sub forum.
Also it would be cool if players got an axis or allies tag next to their forum names, might also help point out fan boys
Either way the war map is great, I'm so happy to see it in after all these years, keep up the good work!