Whatever this ENY thing is it's not working very well. This is not the only multiplayer game with squads, doesn't seem to be a problem elsewhere. Just team-balance the first squad-member to log on, and let the rest of the squad follow. This is easily automated.
“Because some people like to play for one country and not the other” is exactly what you get when you don’t force team-balancing. People start to get nationalistic and shait and pretty soon you’ll have people hating each other for being on different teams. This is supposed to be a game in good fun, not some pseudo-virtual world of nationalism gone bad.