@Nyn - I'll have a think about that one, I'm trying to avoid changing the Goodreads plugin for a bit longer while I work on a couple of others.
@bookmonster - thanks for the kind words. Nice to hear someone else has interest in that feature when it does appear in the plugin one day
. I'm not sure when that will be but obviously the more interest there is the greater the likelihood I will look into it.
As for your linking question. First and foremost any linking is done by ISBN if it is present on the book. So if you have the right ISBN, it should link to the same edition on Goodreads. You might find my "Extract ISBN" plugin useful if you have ISBN inside the book format. So you would add the book to Calibre, use Extract ISBN to grab the ISBN value, and then download metadata/link to goodreads.
If you don't have the ISBN, then the search results it displays are very limited in the information Goodreads gives back to me unfortunately. So in that case click the Search Goodreads.com button, and expand the "xxx Editions" link for the book it finds to see all the variations Goodreads has. Then just drag the link for the particular book back onto the plugin dialog.