1. A lot more variable weather, not super duper technologically advanced please, that will only make for long work days for you and poor performance for us
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2. A good wood damage model, as some BoM planes have wooden structures.
3. Living airfields
4. Simplified FMB in terms of 'coding' which the average joe can handle to a certain degree. Which would help 3rd party campaigns mission makers a lot I would reckon. Also, award system and more like '1946' pilot career statistics.
5. An AI who you can correspond with, and does what you say and inform you with useful information. Like spotting stuff on the ground or announcing distant formations of which identity is not certain. In short, more human.
6. A challenging AI in terms of fighting, energy fighters using BnZ tactics ect.
7. Well researched FM with presentable information to the customers.