Dear,
Some pdfs contain blank or unnecessary pages (usually at the begining or the end).
Could you add a feature to remove them?
Some pdfs (or some pages inside pdfs) need to be rotated. Could you add a feature to do that?
As a suggestion, you could clone PDF-XChange Viewer: see Document>Rotate pages (but the current page should be the dialog default, in my view).
Kind regards,
Jeff