"A part of me thinks that i can use the pizza oven as a smoker also, but on the other hand its not really the same. Has anyone done this?"
I could be wrong, but a pizza oven would probably get ruined from all of the seasoning from slow cooked meats. By that I mean it'd get all greasey and nasty.
That being said, I don't have a wood fired oven. If I did, I don't think I'd cook anything in it but pizza and breads.