Oh man, my options screen is an unholy abomination. Try selecting xinput and then "map keys" instead of save and exit. Or maybe it was set to dinput by default? Save & exit should make your gamepad work though, so I'll have to go and check my code again. The config file should be in appdata/roaming/RRShooter, though if f4 didn't help deleting it most likely won't either.