In my line of work, I regularly use "spaces" to divide a project into more manageable zones. This tool is helpful for quickly counting all the markups within the space.
The only downfall is that if a count (LF, SF, etc) extends past the space, a partial count isn't provided. It would be great if it appeared in the markups list for export.
Alternatively, a tool to draw a line between the boundaries of an area so it could be divided would be equally useful.