Feature request: commit to / update from directories

I'd like to be able to pull changesets between local branches without
having to round-trip to the server.  Basically, when I've got two
branches, a stable branch for bug fixes and a development branch, I
often discover a small bug in the course of working on the development
branch that should be fixed in the stable branch, because it is a
small bug fix, but also needs to be fixed in the development branch
because it's interfering with the larger work I'm doing.  Usually I
end up doing this:

cd stable-branch/
... fix bug ...
cdv commit
cd ../development-branch/
cdv update -R cdv://server/stable-branch/
cdv commit

This is fine, normally, but it has a few drawbacks:

* It generates an extra changeset for the merge, which clutters the
history and pesters my workmates with commit emails.  I'd rather
just keep working and commit all of the bug-fixes from the stable
branch into the development branch in one bunch.

* It's not possible when working offline, say while on a plane or on
vacation (which I have done a lot of lately).

* It makes it impossible to have multiple branches of a project that
is totally server-less.

The other alternative is to generate a diff of the change from one
branch and then apply it, which just ends up mixing the changes from
the bug fix in with whatever uncommitted changes I've made in the
development branch.

If I could point the -R option at a directory in addition to a server,
and pull in whatever changes in that directory are not in the currrent
directory, that would solve these problems. It would go like this:

cd stable-branch/
... fix bug ...
cdv commit       # (or commit -n if I'm working offline)
cd ../development-branch/
cdv update -R ../stable-branch/  # pull in change sets from other branch
... keep developing, possibly repeat this process ...
cdv commit       # (or commit -n if I'm working offline)

Commit would work the same way:
cdv commit -R ../development-branch/ 

What do people think?

-matt