Our workflow is such that we want to clearly define when control of a review moves to a different participant. For example, I create a review and annotate it, and then move it to the inspect phase. The review progress then appears in my action items list (and on the system tray window) as "Waiting for comments".
However, as soon as the reviewer makes their first comment, it switches back to Perform, which is a nuisance since frequently the reviewer is still working on the review - they may find that a later file answers a question they'd asked, so they go back and delete an earlier comment, or edit one. The result is that I start responding to a comment which then gets updated or deleted by the reviewer, who isn't expecting me to have resumed work on the review since they haven't yet clicked "Wait".
It would be nice to have an option whereby Collaborator will leave the review progress as it is until the "Active" participant(s) click "Wait" to wait for further activity. This way, the reviewer can add/edit/delete their comments, approve files etc until they're happy that it's ready to pass back to the author, and only then have the author notified that it's ready for them again. Similarly, when the author then responds to the comments, the same functionality would prevent the reviewer from being asked to respond to the comments until the author had finished writing them.
This would not need to prevent participants from participating at any time, as it is very useful to have this ability - it would just prevent one person's changes from causing other participants to be notified and the review progress on their action lists to change.