It would be great if you could add the option to add #firstpage and #lastpage to PDF filename. Lots of typographers require that in order to keep publications in order.
I work for a monthly magazine and in our workflow we create single articles that we gather into an InDesign Book. This would avoid the need of renumbering ALL the publication filenames – in case something changes in the articles order of appearance – and rebuild the Book before the PDF creation (I do this via a script by Peter Kahrel that exports the Book as single documents)