It takes some clicking and scrolling to go from a book to copying the family ID for merging.

It would really help to have a quick "Copy family ID" link in the Librarian Links that will put the ID on the clipboard. That should hopefully be a small change, but one that would make family merging a lot faster.

(Goodreads has librarian tools that allows you to select duplicate families from a list of all the author's books -- easy tools make it much more likely that people will make a quick correction when they see the issue)