A track editor would be cool. As far as the dev's reason for vetoing the idea, that's the deal with user created content, most of it is going to suck but there will always be the diamonds that make it totally worthwhile.
I use the default view, mainly because I wasn't aware you could change angles!
@ Silks, my first (and so far only) experience w/ online wasn't great, the host just wouldn't seem to start the race even though the lobby had been full for quite a while. This happended in two lobbies. Very annoying! (note to devs, implement an auto countdown when the lobby is full). However, an online tournament sounds like the kind of thing I'd enjoy, I'll check it out.
Zone mode is awesome, I can't wait to put some music on my PS3 just to admire its beauty.