The touchring LEDs (for Intuos4 and Cintiq 24) and the button LED should be exposed through device properties so that clients such as gnome-settings-daemon don't need a helper to set which one is turned on.
See patch at http://thread.gmane.org/gmane.linux.drivers.wacom.devel/4275
The patch in that thread doesn't apply anymore.
OLEDs are now handled through the kernel directly, and through polkit helpers.
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