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This has probably come up before, but for some reason I've been on the losing end of some really rough games lately and this has come back to the front of my mind.
In ARAM - surrenders should be allowed much earlier -- like 10 or 12 minutes. It's really painful to not be able to do anything while the other team decides to just up their kill count for 5 or 10 minutes rather than finishing the game.
In Summoner's Rift, surrender votes should succeed at 3/5 rather than 4/5. One silly duo queue trolling the team should not force a team that wants to surrender to have to continue to slug it out for another 15-20 minutes.