I was thinking in conjunction with lives we could implement a time limit for the game. Instead of having a set goal to win, how about one side merely tries to get more 'power' than all the others? Have control points give back lives every x seconds/minutes and have 'checkpoints' every minute or so that replenish a team's lives by about 5-10, or make lives purchasable. Making these games last about 5-10 minutes at most would make for quick, tactical gameplay and a ton of fun. If the enemy is being too aggressive, they'll most likely run out of lives temporarily and allow the other teams to make up for lost ground. It's logical to allow this, but no more than about 30 seconds to a minute- hence the idea of 'Checkpoints'.