I was told by the replicator that adding additional PDF's to the DVD caused the packet problems that prohibited replication, ...
For anyone else looking to this in the future, do you mean you added acrobat files as part of rom content? Or where in Encore?
Another method for simple putting the text for a link on the jacket (or in addition to), is to add a menu with the text and simple add a "back to main menu" button. Then link to that menu from one or more menus with a button "Resources" or such.