Once a report of more than about 50 pages is created, it would be very helpful to enable the administrator/user to export a specific subset of PDF pages to be exported by selecting a range, like in most programs out there. Not fancy; just a functional way to export specific subsets of a visualization.
I have a visualization with over 21000 pages, which makes any sort of export unwieldy. It would be useful to export only pages 1000-1500 or 9500-9999 (for example), which are still large reports and yet not as thick and useless as a 21000 page PDF report.