'--make-parents' for 'svn add'

So, after adding '--make-parents' support for mkdir, copy and move, I
though up another possible use. 'svn add' could be augmented to support
this functionality as well. If asked, the client would recurse up the
directory tree looking for a working copy, and then back down to the
target, adding directories to that working copy as it goes.

Is this functionality actually useful? The scenario I envision is
somebody (or some tool) creating a large tree structure, and then a user
just wanted to add a single file without having to figure out which
directories need to be added as well.

Thoughts?

-Hyrum