Thanks for submitting an idea for SDL TMS. As you may be aware, we have plans in place to replace the current Client Review interface with a new editor that will be shared across all SDL products. The editor is "inspired" by the existing SDL Trados Studio editor and, as such, will ultimately provide the same filtering functionality. This means that you will be able to show only repetitions (for example). Keep watching this space.
"Not Planned" indicates that it's something we will do but that we haven't yet announced a release for this feature.