extend features in reader

The following has a list of the possible usage rights: http://blogs.datalogics.com/2012/10/03/reader-and-livecycle-reader-extensions-in-the-limelight/

along with a short description.

Here's a list of usage rights that get applied with Acrobat when you select the menu item you mentioned:

FormFillInAndSave, FormAddDelete, SubmitStandalone, Signing, AnnotModify, AnnotImportExport

Note that Reader 11 and DC can do more without usage rights applied, template spawning for example.