A lot of these things were implemented, it depends on the plane in question. I remember playing B17 The mighty 8th (the second game) and you could set salvo internals on the norden (so i guess the same goes for B25s, B24s and anything with a norden bombsight).
Personally i'd like to see "personalized" systems according to what each aircraft had in reality, instead of a single system for every bomber. I'm also eagerly waiting for night time nav aids that will allow bombing blind, for example in a He111 (i think the system was called knickebein).
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