Thanks for the useful post about your experiences with the whole process! If you ever have any other questions please let me know and I will try to help. Its kind of difficult to list all of the features of the arducopter code, and more and more get added each month! The next release of the arducopter firmware will feature the auto tune process which will be great for anyone looking to build their own quadcopter! check it out below
As for the categories, there is also the option for no category if you feel it does not fit anywhere. Otherwise for now I have kept the number of categories to a minimum as the forum is still quite small, as it grows bigger I will add more relevant sections/subsections. If you (or anyone else) have any category suggestions please let me know!