After a bit more research, I can see a reason to get rid of the swim speed, since waterbending was learned by watching the moon and tides, rather than fish:
(???? = characters that my computer can't see. anyone know where I can get a plug-in to read Chinese characters?)Originally Posted by Wikipedia
Still, I think the ski/water walk thing should remain a seed. It still seems like something that would need to be learned. Not sure why, just kind of a gut thing after watching entirely too much of the show for the past couple days.