AM sure I'll get all kinds of smart A** replies to this. But my Idea is this, since we have a major problem with any given two countries ganging up on the other. How if HTC established a monthly perk bonus, (50 to 75 points)to the country that has the most map wins in one months time. For a player to qualify for said bonus, they would have had to fly with said country, x amount of hours ( 96 to 106). My thinking is it would help get back to the original idea of the game play. ( which has been lost on a lot of players) and may help deter the mass two country rapping's that occurs way to often. and maybe eliminate some of the stale mate maps. Just a thought 
Forcing a paying subscriber to not be able to do what they want is not a very good idea. In more importance you wish to reward players for rolling bases, which would bring up the horde argument.
Further if you are worried about two countries rapping, don't be, most of us probably are not musically inclined. If you meant Raping, that would be in conflict with your wish in which you are requesting that players be rewarded for staying on the "winning" team.