I have been using that tool, which is good, but the problem is that you have to keep resetting the filter when you need to select a new area of points. It works (and a good first step), but kind of a pain with larger edits.
Ideally a limit box (similar to many other point cloud tools), pretty much like region box in Agisoft, but only that only controls the current view of points. So you can dynamically edit the limit box as needed (move, resize, etc.), instead of selecting a new area, filter by selection, the reset, and keep doing over again.