I had this same issue last weekend. WildWolf insisted I blow out my config and cache files and re-do the entire process from the FAQ. I ran back through the entire process althought I SWEAR everything was set correctly, and the issue stopped. I have a 1080p screen so min was more like locked to 3/4 of the screen, not 1/4, but it sounds like it could be the same issue? I re-extracted everything, recreated the cache, reinstalled DemulShooter folder (I'm using the WIP 10.9.9 not the 10.11), re-patched and re-assigned controllers in DemulShooter and for whatever crazy reason all 3 games worked fine. I feel like it was cache related. Hope that helps.
The buttons that move the pirate steering wheel are mouse wheel up and mouse wheel down. You need to emulate those buttons with a keyboard key. So the code you quoted replaces the wheel up and wheel down with Left on keyboard and Right on keyboard. You can change Left:: and Right:: to other keyboard keys if you prefer. You cannot map direclty to an Xbox controller, you need to then map the Left:: and Right:: to buttons on your controller.