[Andrew]

I think we're unlikely to do something like this, at least not any time soon. (I could imagine getting closer to this in OmniGraffle than we currently do, but probably not to your expectations as outlined above.)

Just to make sure, you realize that you can do most of this in Preview, right? The drawing is _very_ basic, but it does let you rearrange pages in a PDF document, drag pages in from another document, etc.