@aaaccc1
Remapping the core controls will not affect the the main control configs at all. Rather, it will create a new .rmp file that will be automatically loaded everytime the core is loaded. Should you ever decide to switch back, you could just return the core remapping to it's original state by changing the controls back and saving the core remapping again, or if you don't happen to remember what they, you can always just delete the remapping file altogether. At that point, RetroArch would have no remapping file to load, leaving the original control scheme in tact.