Pressure Sensitivity for USB Multitouch Tablet pointing device

[MorningSong]

I would like to run a Linux host on a Wacom Penabled TabletPC (Supporting both a pressure-sensitive pen and capacitive multitouch), and run windows-only, non-wine-compatible programs like Corel Painter in Virtualbox.

Unfortunately, it seems that neither option for emulating a USB tablet reports pressure data from the host tablet device. And, given the nature of the hardware (The digitizer is the primary input device for the whole machine, so the host must still be able to use it), USB passthrough is not an option.