I remember having the same problem a while back, and all it took to fix the wacom permissions was adding
KERNEL=="event[0-9]*", MODE="0666"
to your /etc/udev/rules.d/40-permissions.rules file.
thanks. this worked well, now hid acesses all devices. the intuos isn't
still working well, but for that I should go to the other replies I got.
As for the RME Multiface, I used to have one and had so many problems with it that I sold it and bought an Edirol FA-101 for 1/4 the price. Its working great. But I think I was getting bad latency because my cardbus reader did not perform the right type of 'burst-mode' or something.
ok, must look into it.
Joao