I recently bought two Super Famicom controllers for the Wii, and while they work perfectly well in the virtual console, in SNES9XGX only the buttons respond. The D-pad is completely unresponsive, which is strange since the emulator supports both the D-pad and stick on the classic controller.

Is third party support a planned feature? Or since it's open source code, would I be able to mess around and try and make it work?

The controller I purchased was this one (am I allowed to post links?)