As there are so many game controllers and the mapping is not the same for every game controller or you just like it different, now you have a chance to change it! 

I worked my ass off for the first simple customize your gamepad buttons. So first enter "Settings"

Select "Customize Gamepad"

Click the button you want to customize then press the button you want for this action. Do it for all until all are "Defined" only then you can save it. In case you try to use the same button for two different actions you get a simple error message

Enjoy and tell me if you like it.