What I would like to see is the choice of country pop up when you select an arena. In addition, you should be able to see the roster so you could tell the numbers of each country, bases held, and who is flying on what side. Then you chose your country, you are moved into the arena on that side, and cannot switch sides for say 12 hours?
This would stop the CV issue, help prevent the "spying" of missions, and still allow folks who want to fly on the sides that have low numbers to do so.