Thank you for telling me! You are right, the Alt key would probably be the worst for anything, I had actually set the CTRL key for that but a bug made it so that the alt key also worked, it will be fixed for the next version! (which comes out in a few days.)
As for the controller issue I've also tried something but I'm not sure if it will work as it's something I cannot test myself nor it's something I've started working on yet, but hopefully it will also be solved!