I had to sign up for an account here just to thank FIX94. I bought a Hori stick for the Wii yesterday and using your updates made the thing work like a charm! I'm in 16-bit heaven.
Edit: Damn. So it turns out it only worked for me with genplusgx 1.7.3. No luck with snes9xgx 4.3.2 or fceugx...