I would quite like a simple button at the top of the list which just separates the categories. Possibly a series of buttons so that I can make my choice depending on my mood or the time available. It still takes a long time to read all the above line threads when I might want fancy looking at computer tech stuff or be in the mood for a web search to help someone find lyrics.
Simply tick your boxes and click refresh...

Quack!
GtD.