I'm sure I've said this before, but I am seriously jealous of your low-level knowledge, particularly of the Windows operating system. Bravo, I look forward to seeing the library.
I agree that the taskbar interface is so marginally useful that I would actually be disappointed if NI wasted any time on it. There are so many things that would be better served with developer time. If you want some examples, just scroll through the top kudos'd ideas on the Idea Exchange. However, if you really do think it's that valuable, you should add it and see if you can garner support for it.