Snipped from an email reply I sent:
As you have found, currently in the master branch of ShutterStem there is a CouchDB [old-style] external written in Python that lets a user import/export on the machine running that CouchDB server. This was a pain to set up, and not great for many workflows (e.g. importing from laptop straight to home server when it is available). That's why the more active "take_three" branch is simply missing import/export for now — so other import/export tools would be great!