This would be a very useful feature for us here at Boeing as well. For example, the use case where this would be useful for us is a huge glob of new code being developed in multiple sprints. Say there's an overriding design problem that's too global to be tracked as an individual defect on an individual line of code, but is pervasive throughout all the files (a minor example: having a virtual destructor when the class doesn't have any virtual methods and isn't meant to be derived). This bookmarking feature would allow marking the file as "reviewed", but not "accepted.
For us, having an additional button next to "Accept" like "Reviewed" that places say a yellow checkmark instead of the green checkmark.
