Hey Karbo,
thanks for this driver. I'm happy to see that the Reaper Faderport implementation gets some updates
I'm using Renoise+Reaper as DAW's. Some time ago I also implemented a FaderPort driver for Renoise.
http://code.google.com/p/airmann-faderport-driver/
Though it has a slightly different feature set, the main features are the same as in Reaper. I also wrote a PDF manual which covers the complete Faderport MIDI command set and some Faderport-related troubleshooting.
Maybe this can be helpfull in any way ?
See also:
Controlling Renoise Pre-/Postmixer with Faderport:
https://www.youtube.com/watch?v=ssKPukAepyg
Controlling VST Effects with Faderport:
https://www.youtube.com/watch?v=HXXOdGBc_gs