It would be super useful to be able to map the customizable keyboard shortcuts in Pixel Studio to gamepad inputs. EG. mapping the undo shortcut to d-pad up, pen tool to the A button etc. This would be especially helpful when drawing on a tablet in places where you don't have space to rest a keyboard.
I noticed that in the current version the gamepad L2 trigger acts like the Alt key when using the pen tool, letting you quick switch to the pipette. So maybe this is already in the works?