Hi Lucas,
i did some more testing with your updated program and added another wheel - the Microsoft SideWinder Force Feedback Wheel. The difference is, that Microsoft wheel is autocalibrating and report itself as 3 Axis (wheel, Accelerator pedal, Break pedal) and test program output is double in size ;) compared to Logitech, which is just 2Axis (wheel, Accelerator pedal & Break pedal are reported as combined pedal).
I also noticed a difference in output, when i installed logitech drivers, so that's the reason, why logitech is there twice (first was used with some generic windows autoinstalled, then i installed the driver and run the test again).
That all tested under 4: * WinXP 32bit SP3 * WinXP 64bit SP2 * Win Vista 64bit SP2 * Win 7 32bit SP1
Enjoy, if that helps you or anyone else :)
Regards, W.