Thanks for getting back to me so quickly, Bret!
I've uploaded the results of USBJSTIK /J:0 as a video because the results are interesting haha
https://www.youtube.com/watch?v=1CE1ZJPUqPQAs you can see, the stick has a single slider (using 8 bits I'm guessing), which USBKSTIK detects are 8 individual buttons. Moving the slider slowly from top (00000000) to bottom (11111111) and back again you can see it counting up/down in binary! haha
Thank you very much for looking into it. I consider the stick to be very usable as is, but it would be nice to have full functionality.
P.S. I also tried a wired XBOX 360 Controller if you'd like the reports from that, though it seems to need a lot of work to get it going as it wasn't detected by USBJSTIK in any capacity. Power/status LED on the controller flashes constantly once USBUHCI is loaded.