When printing a "Poster" or tiled printout, where the PDF is not scaled but is printed on multiple sheets, one should be able to selectibely only print certain sheets. This is useful, for example, if you have a 15 or 20 sheet print of some architectural plans (or any large file) and you have a printer error with 2 pages to go. Now you have to re-print everything, which could take an hour or more depending on printer, and is a waste of energy, ink, an paper and harms the environment. Another use of such functionality is if I need a full-scale extract of a part of a really large file. Like some architectural plans from my architect, where I just want to print 1 room's worth so I can mark it up with a pencil and scan it and send it back. (And need to be able to make measurements so it has to be true 100% scale). I should not need to print 15 or 20 sheets to just get one small piece.