some good thoughts Ian,
the possibilities for night flying have been given a boost with 4.10 and 4.11 will hopefully maintain the momentum
couple of other things spring to mind:-
Flares as an object that can appear at specific times- target marking/illumination of bomber stream. 15km visibility (of object) would be good here
Burning cities- the ability to simulate this would be great- possibly as an additional destruction 'brush' in fmb???. whether it's possible to achieve a suitable viewing distance with game engine could be a problem
Bombsight illumination- if we ever get flyable bombers whose main role is night bombing (we can dream of Lancs but Do217 is possible???) the ability to read the bombsight against 'black' ground becomes rather important