Hi Thom, you might look at gradebook_cdc (in CVS/contrib-this adds weighting, letters, categories, and more to the moodle gradebook->manual here) for an example.
You may not like it, but Jeff commented the code a bit, so it might help to get orientated.
If you like how it works, there are plenty of things it could do better and we'd be happy to share coding on it.
Newbie wants to help...
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