I'm pretty sure that FotG will be fairly impossible on insane, as it's a universe where the odds are even more against you. Ships in Star Wars are way more fragile than those in FreeSpace, especially TIEs. So playing as a TIE on insane, you pretty much have to fly a perfect mission. I'm sure there's some crazy bastards out there who could do it but they'll be few and far between, and the game will not be intended to be beatable at that skill level. It will probably be more of a survivor mode for each mission, you can brag about how long you managed to stay alive, or how many dozens of times you tried a mission before fate smiled on you and you managed to accomplish all your goals intact.