Beaufighter: why isn't the rear observer position usable?

[_RAAF_Firestorm]

I'm pretty sure that the DAP Bristol Beaufighter Mk21 did not have a .303 in the observer's bubble. Again, I think the gun itself is not the priority here, the improvement to situational awareness is critical.

In essence, The Beau Mk21 is the only AC I know of in this excellent Sim that was released substantially incomplete. I believe that it would be great to finally plug this gap.