as far as i know, the extended features of a wacom tablet (tilt, tool-id, etc) without special drivers. i’m not even sure, if the wacom works as a HID device.
i have a serial wacom, so i guess it should be quite possible to make a patch in vvvv, especially, if you only need to support one model. i tried to get some information about the protocol from the linux wacom driver sources, but i’m not a c programmer (and a very good programmer in general). in fact it is just a simple sequence of bytes, but i don’t know how to interpret them. also you need to send some init sequence to the wacom (iirc there are at leat two modes the tablet is running at, with an intuos)