I'd like to see wingtip contrails when the wing is heavily loaded in a turn.
There are certainly plenty of photos in the world to prove that a high G turn in a piston fighter often does create visable vapor trails.
Adding these to AH would not only increase visual immersion, but would also be helpful as the pursuing pilot to see how hard that victim is really pulling on his plane.
Now that the smoke system is working fantastically, it seems like this would be a great use of it!
Thanks for your consideration.