When you say "PDF bundles" are you talking about how there are multiple individual PDF files, or a ZIP file containing PDFs?
Viewing post in Better support for PDF games
In the cases I'm looking at, there are, say, three distinct PDFs for a game. I'd like to have a ZIP containing them (or something like that), so that I can click "install" in the app and get all the PDFs, instead of only being able to choose one, and to get another one having to uninstall (read: delete?) the first PDF.