Yes, I did make progress by editing the file you mentioned. It took some trial and error but I did get it working with my wireless xbox controller. It actually works really well and I’m happy with it. I have not yet tackled getting a second controller working but will try that soon.
The ipac controller I was using for other emulators won’t ever work for N64 since this system requires the analog stick. PSX also has analog but is playable with the 8 way joystick that the ipac is connected to in my setup.