I don't think anyone ever wanted this before. I still don't know what
you'd want it for, but I implemented it for you in b2a21c4eac on the
theory that there's some interesting reason.
Ah. No big deal, but we should get better at avoiding that. I like
the thing they do at github where they all push with some frequency to
named branches, so whenever you fetch your remotes you see a diffstat
summarizing what everyone has done recently.
http://scottchacon.com/2011/08/31/github-flow.html
I don't see any obvious issues with the implementation. (That's
pretty close to the nicest thing I say about code most days, to give
you a little context.)