Make shared notes in Google Reader per permalink available via API

As I just posted in the Intense Debate feedback, it would be great to be able to access all the shared notes for a particular permalink, which would allow the site owner to see all of the feedback in one place.

As far as I can tell from the API, this is not currently possible.

Desired API behaviour would be to pass in the permalink as an argument, and get back all the shared notes.