We currently don't have a high-level way to do this, sorry. If you can
determine how to do this at the PDF level, you can use add_content()
to add the appropriate content to your document.
As an aside, sorry to the slew of posters who just had their messages
go through. For some reason, Google Groups didn't send me the
moderation notifications for the 5 or 6 emails in the queue until just
now.
Brad