Currently I am flying the campaign for the P-51D. With no GPS, or INS I can see how this was the only way to provide a way to navigate. My suggestion is to provide us with the Climb, Cruise, and Descent data. This data will really give us a sense of what it was like to navigate using a compass, stopwatch, and an E-6B.This type of navigation is called Ded Reckoning and is still taught today. Leave the green waypoint squares as an option for those that aren't interested in that level of realism.
Another Idea I had was allow us to plot our routes in the mission builder then just display a navigation log on the kneeboard. This log would import the winds, compute the compass heading, groundspeed, and ETE. That's how it was done in 1940 (except all they had was pencil and paper)
This is the best simulation I have ever owned. I have been waiting for this for a long time. I just need a little more data.