Push to Talk

Currently the easiest feature to add in correlation to what's most longest overdue is Push to talk:
Almost every game with voice chat in it allows for the three default options, full mute, full open mic, and push to talk; the reason why I think push to talk is way more prevalent for rematch is because rematch is a game where I've undoubtably noticed the most amount of people that accidentally turned their mic on more than most, due to the awkward menu system of turning it on and off being bound to buttons used in the game.

Alongside Push to talk I think these menu settings for muting all voice chat and toggling your own also need separate Keybinds, as that is part of the major problem of people unintentionally turning it on through a match.