@Riot: Quick Survey Feature
Was just idling with League open one day and a little popup appeared asking for some question. Didn't think it was a virus or anything of that sort so I answered it.
So then I thought, "Why don't you guys implement this to gather statistics on player reactions to changes?" Have it show up maybe a week after a patch to dampen the initial salt, asking for feedback on specific character changes if that champ happens to show up in a match that you had.
Then you can't just say that a vocal minority is complaining about champion X or Y on the boards coughLeeSinZedcough, and it wouldn't be immensely intrusive or require players to go out of their way to the boards or reddit, as it is right there in the game.