I'm guessing it was snuck in with the Sinai update, Prickly Hedgehog mentioned it during his Sitrep so I went and tested it and it has indeed been updated.
New engine sounds including whistling and the fixed/new keybinds are working for me, it sounds fantastic now, very handy having trim reset and autopilot.
That doesn't mean we shouldn't have the option, and there are plenty of other knobs that could be assigned. The Huey, Kiowa and Gazelle are glaring examples of this oversight.
Props to the devs, really glad I bought this in early access, the update cadence has been great and the latest colour correction plus new more detailed summer textures really help with the immersion when flying low in rotors. Thank you.