Aces High is a game built primary on a flight simulator using WWII airplanes. Flight simulator, not arcade game.
Having said that, there are some concessions to game play, but at the core of the game is a flight simulator. Given the limitations of a computer at a computer desk, the goal is to as closely as possible simulate the real flight characteristics of real airplanes.
One of the concessions to game play is that we get to fly the airplane without the overhead. I can jump into any airplane and take off without having to spend a lot of time doing the pre-flight check and engine warm up. Some people have argued that Hitech should make this part more realistic. But that would mean that I would have to spend a LOT of time learning the specifics of each airplane. As it is now, I can switch from a P-51 to a Fw-109 without having to learn a lot of new stuff about the airplane. I can concentrate on the flying part without having to pay attention to the oil temperature (for example).
Now for your specific points:
1. Auto takeoff
That's part of "flying without the overhead". Some airplanes take a lot more to get off the ground than others. This and auto climb are also concessions to the fact that I am flying a flight simulator on my computer at home. This is especially true for bomber pilots who can auto takeoff, then let the plane auto climb. In the mean time the pilot can do some real life things without having to baby sit the computer. The drawback to this is when you get caught and shot down while Away From Keyboard, or if one of your kids tries to help you fly and crashes your B-29s. (one of our players shared this experience with us)
2. Combat trim
Again, "flying without the overhead". Different planes are trimmed differently.
3. HUD for for what should be read from one's own instruments like airspeed and altitude
This is handy for someone who hasn't learned to read instruments yet, or whose eyes are fading.
4. Fighters performing "impossible" jerking and flopping around in order to avoid getting shot when someone is on their 6.
How do you know they are impossible? Have you tried that maneuver in a real airplane yourself? In truth, some of what you see is due to network lag. Nothing we can do about that.
5. Intentional head-ons.
That's behavioral. You can't really program that out of the game. You would have to program it out of the players, and you will never be fully successful at that. As much as we hate head on attacks, some pilot training actually taught the head on attack.
6. Complete immunity to getting hit by "friendly fire" from automatic anti-aircraft guns.
Kind of necessary for game play, along with killshooter. And it's not complete. I have been hit by friendly ack a few times.
7. "Suicide runs" by 190s, 47s, 38s, etc on an airfield to easily take out hangars for vehicles and aircraft and perhaps other things.
Again, this is behavioral. You can't program the game to eliminate this. And again, it is a tactic used during real combat.
Hope this helps. The biggest thing, as I see it, is to keep in mind that this is built on a real flight simulator, but that flight simulator is running on my home computer, with all the limitations that come with it.