You can use the steam controller to play league of legends O_O
I just got a steam controller today and was testing it on various games. I was about to go play a game of league and thought wait. This might work with league. And I got into a custom game and it does. You just have to change the hot keys to the buttons on the controller and it works pretty alright. It definitely is not better than keyboard and mouse but maybe for dominion/arams and with champions like
where you don't have to have a ton of mechanics I bet it could work alright.