Proof Progress Capability

I've heard a frequent complaint from users that when they try to proof documents with more than 20-30 pages, they have a hard time confirming with themselves which pages have actually been reviewed.

We need a feature to be able to "check off" pages that have been proofed by the user, so that they know what they've already reviewed. This is especially useful in cases where you have a 100+ page document, and the user has to look at the proof in multiple sittings because they don't have the time to dedicate to reviewing the whole proof at once.

This "check list" would only be for the user; I don't believe there needs to be a mechanism to "audit" the proofing of the user to make sure they checked every page or anything. Seeing other reviewers' checklists would only cause more confusion.