"Here's a thought:
There is a mechanism for the Fighter Controller to report enemy aircraft. So the game is detecting aircraft and responding with information. What if the game detected the presence of freindly aircraft within 2miles and 3000ft of an airfield and reported local wind and pressure be it QNH or QFE. "
I don't think it matters one bit if its QNH or QFE wrt to bandit Altitudes. The early CH height fiinding was very basic arrangement and not very accurate at all. Certainly not within the difference that might be caused by using QFE or QNH as a reference