Air Warrior allowed each position to be maned as well as allowing anyone on board to jump to any open gun position. It was great fun and very realistic . There were a few crews in AW that were made up of WWII B17 vets and they were pretty good at fighting there way into a target and back home again.
The basic problem with that happening within AH is the numbers needed to fully man one B17. You can't get 11 people to join a mission most of the time.