This would be great. I just stayed in about 10 or so Airbnbs on an extended trip. A number of them were run by someone who didn't live there, but would, for example, leave a lock box outside the door with the key, and tell us to put the key back when we left. The best stays by far were in the places where I was staying with someone who lived there. It added a lot to the experience staying there.

I doubt this will ever show up as a real filter, though. Maybe a "this is this host's only listing" badge or something could happen.