Yeah, I'm excited about this project, and even more so about your larger project. Actually, to "remap anything to anything" is something I have wanted for awhile. In fact I was at one point thinking about making a software or hardware solution for this by intercepting and modifying HID packets. I was thinking about doing that because there was just so many times that I wanted to remap something, but software got in the way and there was no solution to solve that. What I'm saying is that I'm sure I would have a lot of uses for your software as I have already tried (and failed) to do this kind of stuff many times in the past.
About the VIDs/PIDs, The device only has one VID and one PID (and only shows up once in my device manager), but has multiple IDs in AHI (but only one of the IDs actually works). Also more concerning to me was that my tablet isn't detected by AHI, yet I can still use it.
About the absolute positioning, I was more concerned with the apparent non linearity of the absolute mode, but after playing with it I've realized my test script had a couple of issues with ordering

and that it does indeed work properly. One could always write method that does correspond with the pixels, though as I think about it, it starts to seem like a bad idea (it would get screwed up by changing the tablet/screen area).