Stellarium helps the user get their bearings using the cardinal point feature - the Norht, South, East and West markers on the horizon. CompassMarks takes this idea and extends it to add markings every few degrees along the horizon, and includes compass bearing values in degrees:
Using the CompassMarks plugin
There is a tool bar button for toggling the compass markings, or you can press control-C.
Note that when you first enable compass marks, the cardinal points will be turned off. You can have both active at once, but there is a small bug which means you have to press Q two times to re-enable cardinal points after enabling the compass markings.
How you can help
A TODO list is maintained in the README file for the plugin. If you are able to help with any item in this list, please contact the Stellarium developer team via the stellarium-pubdevel mailing list.
We also welcome bug reports, feature requests and feedback through the usual channels (trackers, forums and so on).