If level bombers that are playable are included I hope to see realistic bombsights for the appropriate planes. Also make bombing more realistic by having to factor TAS from IAS with the charts included and taking target ground height into account. Also have a map with all necessary navigation tools that can be access on the ground before takeoff or even before spawning. Having this map sharable with others wouldn't hurt.
Also, IMO, from an mp standpoint, there is no need for making every gunner position available in two or more engine level bombers. How many people really use them? I never use them except to look around and I'd give that up. These should be manned by AI as currently done and which communicate any issues to the pilot. The only thing needed is the pilot position, the nose position, and looking through the bombsight. Whether another person could join as the bombardier couldn't hurt but not necessary. I would think this would help not only in the development of the aircraft but also the impact on resources.