@zing I'm not able to test it out, but I do believe this should work for the console emulators (so thank you), but for MAME each individual game (on PC anyway) is able to take a custom input for that game, and that game only. Usually, you have to press TAB and it will let you modify the buttons for that specific game, I'm not sure why that has been disabled for Recalbox. Then again, they probably have it hidden somehow.