Reconnoiter : Yes, I have not really been happy with the drop down menu. I have plans to change it to something better. Thanks for the list, I completely forgot about "Wads".

Community - When Visiting :
Open the menu and go to resource database. You'll see the 9 parent categories that are already created. Each category will soon have a set of sub-category filters. These filters can be selected individually as well as together and your selection(s) will display within the sorting database list.