Frets on Fire is open source, so it's not an 'SDK' it's the full source code that's free for anyone to download, modify and submit patches for. It doesn't really compare to Audiosurf's closed source nature.
As hex pointed out, even if Dylan was willing this wouldn't really be practical.
Audiosurf uses Quest3D.
Quest3D is a very expensive package.
It pretty much ends there.
Additionally I simply don't think that the Audiosurf community is large enough to support this. The biggest issues with Audiosurf are not the visuals, but the niggling little bugs like it losing performance over time, having huge memory leaks when reloading textures, taking 10-15 seconds to close after clicking quit and as you mentioned the 'jump to song' resetting when using arrow keys/mouse wheel.
Some of these bugs are easy to fix, some require some pretty deep investment in time (the performance issue one for example I think would require an engine rewrite, I don't think Questviewer is capable of improving on it) and I would question if there are enough people in the community with the technical skills (and the time) to fix these.
Honestly, I don't think Audiosurf needs any visual improvement. It looks good enough as it is. There are some additional customisations that could make it look cooler (being able to change the road model, ship models, scenery models) but ultimately the visuals are of a high enough quality right now.
I would also question again whether there are enough people in the community to create the models/etc to truly enhance the visuals rather than just change them.
The short answer to all this is that it's not likely to happen and even if it were it would require anyone working on it to buy Quest3D (
http://quest3d.com/index.php?id=156) for which the cheapest version is €599 (might even need one of the more expensive versions). Much as I love this game, I don't love it €599.

If someone in the community were willing to go along with an engine rewrite, it might be possible. But that's a bit of a dodgy issue with all the indie clones flying around these days and it's unlikely they'd get the music analysis software identical.
EDIT: Misread, it's not €599, that's the upgrade edition. It's €1249 for the cheapest full version.