A: It is one out of the 2 versions that can both Rev-Roll into the machines in the Inky and Pinky fights, and doesn't lock Pac-Man on the world map for 3 seconds after a boss.
A: Mainly for emulation inaccuracies, particularly loading times and framerate.
Q: Are USB/ISO loaders allowed (i.e Nintendont)?
A: Yes, ISO loaders in general are considered emulation, thus runs can still be submitted until the categories threshold. The reason for disallowing them competitively are from faster loading times and reduced lag.
Q: Does Wii load faster than GameCube?
A: It's been chalked up to being no significant difference or if there is it's extremely minimal that it doesn't matter, though it has yet to be tested more in-depth.