Sorry for the false alarm! Someone pointed out to me that I interpreted the request incorrectly. While you can now select objects both in the artboard and on the pasteboard, you cannot yet select objects on the pasteboard and complete artboards themselves.
Amazing how this does not have more votes. This is really important for re-positioning screens with titles and descriptions outside the artboards.
This limitation is such a drag. I have now run into the edge of my canvas but cannot move everything to the top-left canvas corner at once (since I cannot select artboards and items outside artboard, such as titles, together).
This is a really important feature for us, we quickly lose overview without this. Of course only the active page should use cache/memory and not all pages in the file...