wacom (graphire) tweaks

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i just followed the HOWTO Wacom Tablet at http://gentoo-wiki.com/HOWTO_Wacom_Tablet , without the sdk flag, whatever that means.

now the wacom mouse is working well, except for the scroll wheel that works for 30px then stop.
the wacom pen is working but it's way too sensitive ... moving the pen for a cm on the pad is enough to make it move half my screen.

does that sound familiar to someone ?
and can i fix this somehow