Is there a way to create a iTunes U feed using .pdf or .epub files using a Podcast Producer 2 backend?

I'm in the process of creating an iTunes U site for my university. We are in the process of activating an Xserve running Snow Leopard and Podcast Producer 2 to server as a backend and trying to figure out how to create various workflows and feeds for populating both the Public SIte Manager "public site" and the authenticated "private site". So far, I have not found any information regrading how to upload .pdfs or .epub documents using Podcast Composer or Podcast Capture. Is this possible?