Re: Shift selection using interactive spec

[Richard Stallman]

    It'd be a disaster to have to restate the whole command or even just the 
    interactive spec to make commands CUA-mode aware.  Right now, if I am 
    using an external package that is not fully CUA-mode aware (like 
    CC-mode), all I need to do is:

That is a valid point -- it is useful to be able to patch an external
library command by adding a property.

However, for writing commands in Emacs, I think the cleanest way
is to use the interactive spec.

So I think we should support both ways, but prefer the interactive
spec.