I have tried about 24 custom games so far. You can tell who has thought things out and who just threw some settings together. This is just the beginning. There are quite a few options that make you think you can change em, but cant.
D.Va's booster speed, like genji's dash, is a set number, while reinhardt, reaper and the like can all be slowed or sped up.
D.Va's mechanics break when in instant respawn mode.
Projectile speed can only be sped up, not slowed down.
and the list goes on. Suuuuper excited and still trying out other's ideas as well as just playing around to see what breaks if I do things. Probably my favorite thing to do in any game lol.