I like some of the replies, but again that was not the intention of what I am saying. annoying? sure , can be dealt with in different strat? sure. but it takes the fun out of frontline. stacking a class that is already OP should be restricted to allow better game play.

and it does not mean it will slow frontline at all, for example, 5 healers joined in one alliance and other alliance only have 1 healer. what will happen , the game will give you option to change, if you dont change within 30sec, it automatically switch alliances members around until balanced set of healers are in each alliance.

an even simpler solution, allow switching to other alliances before the battle begin. where there is switch > person you want to switch with press confirm > switch occur. this will also fix alliances set ups in the begining. should give 2min preperation instead too.