You would use "Actions" to create these batch operations. Take a look at this tutorial, it explains what Actions are for Acrobat X - XI is a little different, but similar enough that you should not have a problem following along:
http://acrobatusers.com/tutorials/actions-macros-acrobat-x
You cannot do this without any user interaction: The user still needs to select the action, select the documents to process, and then start the action, but from there on, you can (if the steps you want to automate allow this) do it without user interaction until all documents are processed.
Karl Heinz Kremer
PDF Acrobatics Without a Net
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