I would love to see a system implemented in-game so that we can report people and have the match footage/audio get saved somewhere on the dev side of things for you guys to look into.
Plenty of players, myself included, have reported people who have done/said some pretty heinous stuff in-game; but if we don't have footage as proof, nothing can be done about it. The average player doesn't have proper recording software set up on their PC (and plenty aren't even in this Discord server), so there are likely a ton of bad actors who get to walk away without repercussions.
TL;DR, it would be great if we had an in-game report button, and using that button would save the match audio and gameplay footage for devs to look at.