Gestures for all wacom tablets are not currently supported. The reason for this is, in order to be supported and be supported decently by a wide range of programs gestures need to be implemented in Xorg itself.
The issue is if linuxwacom or xf86-input-wacom added gestures then a gesture that might scroll in one program would do a completely different and unwanted action in another program. While this could be implemented it could possibly create a very large hassle in the end.
For discussion of gestures (and inherently multi-touch) on the Xorg-devel mailing list please see the following threads: http://lists.x.org/archives/xorg-devel/2010-March/006388.html http://lists.x.org/archives/xorg-devel/2010-March/006206.html