UPDATE: So the right stick as tilt is good, since I never use it for smash anyways.
I'll have to check this out. Been playing since 64, so gcn has been my controller of choice. But the triggers on the gamepad / pro controller were *so* much better that I switched over. I sometimes pull out the GCN but can't get used to the trigger buttons (i use L for shield and R for grab, on GCN I use L shield and X grab)
Plus, the way I short hop nair, fair is by sliding fingers from x to a on gamepad, and use the right stick for uair and dair. Then I slide y to b for upBoos or SHCS. This is a lot harder to do on a GCN as you can't really slide and have to press the buttons, so I end up doing a full jump or mistiming my aerial.
That, and I play most of my smash on the gamepad, since the TV situation in my place isn't really ideal. Yes, I have used the Gamepad as a TV and then used a wiimote + fake GCN XD
I'll have to play around with this stuff though. I've not had as much problem with the Usmash as I did in the past (since I don't have tap to jump) but the Fsmash still comes out every once in a while.