xinput?

Yes, it's great for Windows, and could probably be done in the future. Right now I think most people are working on more central things like actually getting games to display something though. There is also work on getting it to run on Linux, so work on Windows specific stuff probably won't be done for a while.

But, if someone wants to do it, and has the required knowledge to do it, go for it! (just don't break other platforms). The project is open source after all.