Splinter has this, and it's very important for medium-sized reviews and larger.
Without this it is hard to be sure everything has been reviewed.
For what it's worth, this is the sort of thing that needs to be made feasible:
It's never going to be easy, but feasible.
This was actually fixed long ago. See also bug 1306091 for an improvement.
*** This bug has been marked as a duplicate of bug 1147393 ***