If it’s any consolidation to your issue, I use https://www.emudeck.com/ Which will setup most of everything very well. I then run EmulationStation, and go to the alternative emulators section and run PS1 games through retroarch which will give you more options to configure your controls. I always save my remaps to the core so that all games played with use the same control config. Such as SNES games using A on the decks A button because I absolute HATE nintendos control scheme. :)