*facepalm* I keep forgetting that place exists. I'm just used to downloading most rips from here, particularly the GBS sets, because they have M3U playlists with separate timed and tagged tracks.
If it's possible to rip DSiWare music at all, I'd assume it would be. But then, I haven't exactly seen any rips of Pyoro/Bird and Beans, or WarioWare: Snapped! or any other DSiWare.
It's certainly possible to rip DSiWare games. CaitSith2 did so as a proof of concept many months ago. As for how it was ripped (using the "generic driver" or a custom rip), I don't know. All I know is that it's possible. What that entails... well, your guess is as good as mine. Feel free to grab a ROM, and try it out? I think CaitSith2 had to do some file substitution/replacement for it to work, but I can't say for certain, and certainly can't say what was substituted/replaced, if at all.
Sorry to be not very helpful. Mouser X over and out.