Hi Mike,
If I am wrong someone else will chime in but I am pretty sure you don't have control over the ribbon. Those are user set and InfoPath just opens based upon whatever the user had setup as far as ribbon and taskpane the previous time they opened InfoPath.
If you go into Form Options | Filler Features you can see a list of things you can disable but that is about it.
With a browser form you do have a little more control on what shows for the user.
Ted