I would like to have an option where we can turn on "Show Duplicate Frames" via a simple button and have them appear in the Zoom Scroll Bar of the source monitor.

This would save a step when searching for b-roll to cover shots. You would be able to skip sections that are already used instead of cutting it in, discovering you have already used the shot, and then having to go find another. It should also only show duplicate frames for the currently selected timeline, not all timelines within a project.

I think this should be a simple button though so it can be turned on and off as needed.