It's been suggested in the New Feature requests section many times. The word is it will eventually arrive on the scene but perhaps not in the very near future. I'm aware of another p2p app for the mac which arranges files into type. But then that's the ONLY good thing that app does. It was what lead me to LW & after trying it again 2-3 yrs later, it "ain't" improved that much. Whereas LW is improving all the time. Perhaps if you re-posted a request in the said section it might remind the developers it's still a popular request/concept.