This I do not know yet, because after I thought I tried all options in the game under decompresser, when I run without main dat I did crash again due to some missing textures after I tried to look left or right from the cockpit.
I also think that times of the missions need to be changed for each terrain in order to get all palettes and maybe some more (altitudes 😕).
But, you agree, this process of TAW discovery, at least at this stage, is very fast, interesting and rewarding.