Cropping tool not what I expected

For many this program may be great. I bought this to selectively crop individual pages in a very long document. You can crop, but instead of drawing a selection box to crop quickly, you type a numerical size deduction, for each side of the page (4 x). If all pages are the same, perfect. But if each page needs differnt cropping (my situation), then it would take forever. Possibly this could be added in an upgrade?

DoublerGuy about PDFGenius 4