That's one that we've been tossing around for a couple of years now. It's not as easy to do as it is to describe, unfortunately, particularly when there are "holes" in the field. But we are, and we have been, giving the idea a lot of serious thought.
As for multiple views in Site, that's another one we've tossed around for a while now. That one is probably a little easier to do, but it's not requested as often as some other things that we need to get done before we get to work on the interface again.