When testing the Battle of Britain 2 1960th terrain i had the well known problem of the squadron mass take off, that some older airplane types, like the Hunter, had problems in that kind, that some planes stall and crash.
I played a little bit with the missioncontrol.ini and found a solution.
[Waypoint]
TaxiSpeed=5.14444
TaxiTime=0
TakeOffTime=25
InitialClimbDist=9260
InitialClimbAlt=410 <<<<<<<<<<<<< change to this value.
MaxInitialClimbAngle=35 <<<<<<<<<<<< change to this value
So the planes, which took off last, came earlier from climb to horizinal flight and lost not so much speed. This avoid stall and crash. For WW2 scenarios, i think InitialClimbAlt=310 or less should do the job.
I tested if in a flat terrain. I dont know, wheter it will work for an airfield placed in a hilly or mountain area.