There is a solution in the latest retroarch- called core input remapping: if you reinstall retroarch from menu 5 in the setup script (after updating the setup script of course) and open up into the rgui (by pressing select+x)- under the quick menu you can change which core options do what- so you could switch start and select so start is the coin input and select is start or any other variation that is comfortable. That way you don’t have to give up a control if you wish to still be able to put coins in. You’ll just have to make sure that the RGUI saves the configs on exit.
