Re: Highlighting rectangles?

[Richard Stallman]

    In cua-mode, what happens is that you don't have C-x r d at all.
    You use C-w for both cases (i.e. the behavior depends on whether
    you marked a rectangle or a linear region of text).

I see, they have gone all the way to a different design of the
command architecture.  Well, the result could be clean.

What does it do if you invoke some of the dozens of obscure Emacs
commands that operate on the region, such as append-to-file?
Surely this package cannot replace *all* of them.