At the risk of reviving a dead thread. This is my 2 cents about why B-17/B-24 should be added at some point as an AI aircraft. The reason it should be AI is because I feel that the management of the aircraft is more than just those of the plane, but also the crews - so in order to give an authentic experience, that would require IL-2 to go beyond the realm of their concept.
1) They should be AI, as much as I'd love to fly them, I think that in IL-2 they don't fit into the game as much.
2) We have many very high performance aircraft that have been and are going to be released. They were designed around attacking and defending bombers at 27,000ft. I play more multiplayer than SP and currently there is no reason for a P-47 to climb to its best fighting altitude because there is no reason for the Germans to want to/need to fight that high as well.
3) Immersion in SP, to see the contrails of a light of bombers passing overhead while completing ur missions in BP sounds incredibility immersive. Furthermore, a good chunk of Western front ground battles happened on the BP map, so if they ever wanted to release a tank pack for the Western Front with a battle zone or two on BP, again seeing the bombers flying over and crashing around you would be very immersive. (See Belton Y. Cooper's book, Death Trap, for a just hand experience of this)
4) It could be a cool campaign expansion for both Axis and Allies on the BP map to be defending/attacking the bomber streams.