MacBook – Automatic (or a quick) way to add page numbers to a pdf document

It sounds like what you want is to have your PDF docs displayed in a continuous flow on screen with no "page breaks" regardless of length, yes? I don't know of commercial software that can remove the "page breaks" from the onscreen view of a PDF, so my next question is, do you do any programming? In my preferred language, Perl, there are several open source modules dealing with PDFs, and I'm sure most other serious languages have similar capabilities.

I've written several applications whose output is PDF docs (stuff like mailing labels, formatted contact lists, lapel stickers, name tags). From what I have learned about PDF document creation, it's necessary to specify dimensions for the "page" in order to give structure to the number of lines and other layout features, not the least because locations are measured from the BOTTOM left corner of the page, NOT the upper left as is most familiar in page composition software. So I think F'x's comment above has a good hint, which is that if you can dig in there, changing the height of the "page"/bounding box might be a way to get a continuously scrolling PDF instead of one with onscreen space-wasting pagination. Perhaps F'x or someone else knowledgeable could expand on this.

One solution is to print the document after assembling the sub-documents, and to then choose "Open PDF in Preview". The subdivisions between sub-documents will disappear.

At this point it's possible to delete individual pages using ⌘⌫.