Open the hakchi folder manager and do the next: put the 30 original games at the root menu (out of any folder) and then your custom folders at left of the 30 original games will always have the 2P icon and the others at the rigth side become 1P. When you finish the process, move the 30 original games to a folder if you want. That works to me. Sorry for mi bad english.
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In Retroarch, go to quick menu/controller settings. There is an option called change side b at fds games. You have to select a button of your controller (B button, for example) and save the change settings at retroarch. So, when a fds game ask you for b side, just press B button.
Cool. Another Retroarch question. Is there any way to save the video and controller settings for each game ? I get one game in it's correct ratio, but when I try to play another game, it uses the previous game's settings....and so do all other games.