Okay, I hope you can follow me on this one:
I was originally using 1.1.8
My favorite emulator (no knocks from Retroarch fans) is ePSXe. Which worked flawlessly, albeit with a couple of minor speed troubles here and there due to the slower processor speed. Whatever the GPD team did to introduce some or your improvements, they've done it pretty well. Joysticks read perfectly "out of the box."
The LegacyROM is giving me joystick trouble with ePSXe - I've set it up correctly, but whenever I move either joystick, the program starts registering rapid false presses of the 'L2' button. It's constant after you move a joystick, nothing if you don't. You wouldn't notice it if you are playing a game that doesn't use the shoulder buttons, as the joysticks still function perfectly - but a game that uses shoulder buttons has trouble. In Blasto, which uses L2 and R2 as a ?side step' move, as soon as you touch a joystick, the character sidesteps left until he falls off of whatever platform he's standing on...
Tried Fpse, which seemed to not have trouble, but looked like hell - I think it may be having trouble with the new RC Mali graphics, so I didn't investigate too hard...
Double-checked my settings and button assignments - all was correct. Went back to 1.1.8 for the moment, and, once again, my settings seem to be fine.
Don't know if it's them or the LegacyROM, but wanted to point it out. Speed was awesome!
I'll gladly reinstall and try anything you would like, answer any questions, etc.