They let you on the field but you can't kick FG's, at least not to my knowledge. I didn't see anyone throwing a football but I'm sure if you brought one they'd let you throw it around a little bit. The tour is cool though, you get to go to the locker room and the media room where they conduct post game interviews and what not. Fun experience.
"The Dallas Cowboys have 2 types of plays in their playbook: Passing plays, and running plays." -John Madden