I suggest not being able to refuel anything anywhere including at 90,000ft a bit high for a KC-10 or KC-135

   Maybe allowing multiple airport entries, and or suggesting landing spots for those LONGGGGGG flights, (love it when the flight planers tells me to fly from Nova Scotia to  Alaska then to Russia, then to Iceland, for a trip thats well short of 2000 miles as the crow flies.

   Maybe find out what some of the things do in the CFG files you made ???

***Repeats to self "Peaceful thoughts, Peaceful thoughts***