Champion Select Vote System
I've experienced a number of games where a "troll" in champion select would create havoc before the game even starts. It would be nice if we had a voting system that allowed us to "dodge" the game with 4 votes, which would not count against the team. In lower ranks, this happens far too often.
I understand that some people might use this as a way to dodge games if a sub-par player is on their team, so a system where you need four votes would lessen that to a degree. Riot could also add some sort of system to analyze chat and the champ selection vs. lane selection to identify "trolls" and allow the team to dodge.