Report button in champ select (non-abuseable)
--TL:DR - If 3 or more people report a single person, the champ select is aborted and everyone is returned to queue, except the person who got reported. They get a warning not to flame/troll in champ select, and a 1 min ban from joining any queue.
--If you flame/troll in champ select multiple times over a short period of time, (for example in 24hrs) the games where you were reported go to the tribunal along with champ picks and the chat log. This is to make sure people don't have to deal with report button abuse due to off-meta picks or simply trolls being the ones who are using the button. Something like 8th ban gives a warning, 10th goes to tribunal.
--I'm recommending a return to queue because playing a game with people who just wished each other cancer and hurled insults at their respective cousins is likely to be high stress and low fun. I don't care about the chances to win such a game, it just doesn't sound fun to play, so back to queue it is.
--Why not try this out on PBE? Seems simple and effective. Thoughts?
Edit: The 1 min ban is mostly to keep the banned player from entering a champ select with the same players who voted the kick.