Bring back Tribunal
I'd rather have Riot actually work on the Tribunal instead of the current system that's in place. I want a group of people to take a look at an abstract scenario that the system has flagged as "toxic", and even if a case gets escalated, you have a 50% of whether or not the Rioter who's taking a look at your case subconsciously decides against you because they had a bad day. That kind of stuff doesn't happen as often with a group of people.
It's been in "maintenance" for three years now, but we all know Riot. They forgot about it.