Talking about things we'd like to see...
Just one, apart from using my Wii Classic Pro controller to play GC games, I also own a couple of PS2 joysticks with a USB adapter called Twin USB Joystick... it works perfectly with Nintendont using the PS2 controller plugin, but it doesn't rumble. Actually the default drivers for this device don't support rumble either but a couple of years ago I managed to get ahold of new version drivers that do support the rumble feature (Windows XP,7 etc.) and they work great. I wished there was a way to implement these drivers so the rumble feature would be included etc.
Here's a pic of the adapter (its almost identical to mine)
Warm regards
Pepois