After a match there's a long crawl as the game showcases the mechs of the team who won the match. This is followed by roughly 55 seconds of staring at the scoreboard/progression screens, taking a leak, getting coffee, doing taxes, and falling asleep before the next map loads. If we could get that timer cut down to 20-30 seconds and a Ready button that would skip it entirely if enough players pressed it, that would be fantastic.
Somewhat related suggestion is being able to cut the on-death kill cam short by pressing escape to get to the garage faster. Respawn time obviously wouldn't be affected. Not sure how being able to change your loadout a few seconds faster would affect balance, if at all.