Our reviewers often want to provide a comment that applies to all versions of a proof. We may send a proof that has 20-30 different versions all within a file, and they want the ability to provide the same comment on each without having to re-type or only leave them on the first version - when comments are only on the first version, it is easy to lose track of them by the time you get to the 30th.
We would like the ability to provide "global edits" to a proof, or the ability to select a comment and 'apply all' to all versions inside of a proof.