> At the late stages, when he was modifying a lot with the help of his publisher/editor, this was worth its weight in gold.

I know a developmental editor, and occasionally we bond over the the overlap in our fields of resolving rafts of conflicts between versions of big text datasets.

I remember I once showed off Mediawiki as a "just so you know this kind of cross-referencing tool exists", but I think they have their own note-taking strategies.