I am able to modify almost everything except ship ops for some reason using gg it's pretty easy. For the Fuel,hull,reputation it seems that you can only change the current value not the base or max and it will reset when you exit the game. Money and exp (your personal and crew exp) can also be hacked and even the values during combat like enemy ship hull etc,although probably not needed since the enemy will never be able to hit you or escape or do anything against you.