A lot of what you mentioned is probably way outside the limitations of the game engine, particularly 1,4,5,6,10,11. As for 3 I imagine this would be the case already. As for 7, I can't imagine why you would need it. The Il-2 engine does not handle a great multitude of objects anyway.
Who knows, maybe DT can do it. I rather doubt it's possible though.
As for 8, trees are pretty big, but the normal positioning of the camera makes everything seem small, because rather than at eye level it sits maybe 4 meters up. Park a plane next to a tree and let a pilot jump out, and you will be able to measure the relative size between the figure (who is also rather large) to a tree.
You can have asymmetric braking by pressing the rudder key and your brake key together. Release the rudder key to have braking on both tires.
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