It's a double edged sword.... If they allow a choice it would be presumed that some will choose to disable joining matches in progress. This will dilute the available pool of players available. So, in the best scenarios (players left or were booted by something not under their control) you will then penalize the remaining players by forcing them to play handicapped until the system can findsomeone to join the game. You say, well I will just quit if I see its already in progress and Im on the losing team.... Yeah you can do that, but then you risk being penalized yourself for leaving games. Perhaps they should have a power ranking system based on how many players there are. For example each team of 4 splits the power equally 25% each. When one leaves boost the other remaining 3 to 33.3%. If it drops to 2, then 50/50%. If one is left they become like the juggernaut with a 100% boost. If other players join back in then share the boost across however many players are on the team. This way when a team loses a man they are given a boost to the remaining players to make up for the loss of a team member.