Then your program failed completely on the input device currently does not exist. How do your program know there is a controller use [w] as confirm instead of

Then your program failed completely on the input device currently does not exist. How do your program know there is a controller use [w] as confirm instead of [o] when the controller does not even exist when you are writing the program? Although the new controller can just send [w] as [o], you will now have another problem that ui always ask you to press [o] when there is only [w] on the controller. Fix this problem is the sole purpose of that configurator. Don't choose the layout, just let user/system choose them. Although you could still define some preset for known device.