Key bindings and quick cast
Ok so this was something that hasn't quite been that annoying for me, but something that will screw me over the first time. Sometimes when I play a champion that has an ability that is easier to use without quick cast, I'll go to play a different champion and forgot that I had set this before, and it will sometimes cost me my life, or a kill. So I think that having something that will save key bindings and quick cast to a champion, rather than having it be universal for all. I know there is and argument to change it at the beginning of the match, but sometimes it just slips a players mind.