I seem to remember being able to switch between positions simply by using the same keybindings i have for cycling between pilot/bombardier/gunners in the bombers.
The trick is to make sure you transfer control between pilots (i think the same thing happens in the Br.20, which also has a 2nd pilot). I think the default command for this function is ctrl+C. So, switch to the front cockpit and if your stick doesn't work try to also transfer control between pilots.
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