doubles: -make the cpu's players to take less time to serve, and raise their effectiveness at 1st serve
-maybe make it easier to aim on serve?, i find it too hard
-do something about the desynchronizations in doubles-rematches, they are annoying
general: -coin toss to decide who starts, i think it would be useful, today on my doubles match we had to restart like 10 times to make me serve first
