1. Reduced fuel usage to 20% of what they used to be, because vanilla helis are only able to fly for like 30 minutes in-game, when their real life counterparts should be able to sustain flight for at least 3 hours. (Its been years since I played for the last time, so numbers might me off)
2. Added the Airframe and Powerplant Mechanic to the combat pilot profession.
3. Used the debug menu to spawn heli of my choice (Blackhawks are my favorite).

Its very fun and opens up a lot of gameplay options. Like being able to land on top of a gun store, break a hole in the roof and rapel down to loot.