NES select buttons has been mapped to ps4 touchpad button.
Rom folder can be configured in /mnt/usb0/ps4nes/config.json
Rom list can now be scrolled using d-pad.
PAL Roms work fine,
NTSC Roms are a little slower because of the different clockrate of the NTSC NES.
How to use?
1) Copy the ps4nes folder on the root of your usb drive.
2) Change "roms_path" in config.json to the location where your roms are.
3) Install pkg on ps4 and have fun