Auto fill
I am fine with the autofill mechanic in the game, it's annoying at times and possibly unhealthy but I know Riot likes it so this post isn't about removing it. Instead I think it just needs a small fix. I think if you put support as your primary role, regardless of whether or not you get your secondary you should still be immune to autofill. I don't think it makes sense that if you volunteer to play the least liked role, but somebody else gets it you should still get autofilled.