Autofilled

A lot of players disconnect when they see they've been autofilled to the role that they did not want (support usually). I know there is repercussions to disconnecting... But I think for sticking out the role and doing well (i.e. B- or higher) should guarantee you something, like perhaps a Key Shard? Especially when you lose and don't tilt the whole game because you've been filled to support and can't help carry the game.