One of the best stories to come out of JG52 was in the winter of '44. It was so cold (-40) the 109s couldn't start. A shot-down Russian pilot was brought to the base and was walking around the aircraft. Through a translator, he could see why the Germans were having trouble not only starting their aircraft, but dealing with weapons troubles as well.
One of the first things he recommended was removing all the grease and oil from the weapons. The grease congealed to the point that it was nearly impossible for the mechanisms to work. They removed the grease, went to a light viscosity oil, and the weapons performed perfectly.
The second was hilarious. The Russian asked for a couple of gallons of gasoline, which he poured into a pan under the aircraft, and tossed in a lit match. The resulting flames caused the Germans to scatter and the Russian was almost shot on the spot. The fire burned for several minutes and everyone thought the aircraft was done for. The Russian then signaled the pilot to crank the aircraft and it fired right up.
Another trick learned from the Russians was to pour a half-gallon of gasoline into the oil sump of 109s. Since gasoline doesn't congeal like oil, it mixed with the oil and allowed the engines to be hand-cranked. As the engines would warm up, the gasoline mixed with the oil would evaporate off.
(Reference: Blond Knight of Germany, Chapter Six, pgs. 80-81)
Obviously, while these stories don't do much to help with the development of scenarios, they add a level of immersion to what we're doing in the sense that it adds a human element to two aircraft trying to shoot each other down.
J