Really though, I don't see why you need to use a D-Pad at all, ever. I know a lot of games on the VC were designed for the D-Pad, but what's wrong with just enabling the analog stick to do that job? All Nintendo had to do was build a controller with a stick that was analog for most games, but then resorts to the basic 4 cardinal direction digital functions for VC D-Pad games.
I KNOW this won't be a problem because I have a USB gamepad with the analog stick, and the stick can fill in just as well for D-PAD type games if necessary.
So what I'm saying is just eliminate the D-Pad entirely, once and for all. On the GC and most modern systems the D-Pad was seldom ever used as anything except as a way to quickly equip different items or switch weapons. Which made it basically just a glorified set of buttons, really. There's absolutely nothing about the D-Pad that couldn't be handled just as well with an analog stick running in a digital mode.