Here happening an strange issue with PS4 DS4 controller.
If pressing R3 not any input from others buttons.
I use R3 for hotkey fastforward.
Testing for an fix and i see disabling autoconfig has fixed that issue in an core.
That issue is recent.
Now I need to reconfigure all inputs for ANY core all again.
Perhaps that issue with your controller is an bug in internal configuration files or in retroarch code.
Well … OpenEmu has less cores than Retroarch, but seeing your controller is as if you will play consoles from fourth generation.
If the digital is similar as the original genesis megadriver your controller is very good.
You can configure the L and R buttons as being an combo A+B+C and X+Y+Z.
I have used AntimicroX for doing it … works very well. unhappily Retroarch not allow bind the same console key for multiple buttons.
I not known if have any similar software as AntimicroX for Mac.
However if have one is the temporary solution for you … you can map an controller key to keyboard and in Retroarch disable any option using your controller allowing only keyboard input.