I wanted to try the new helo flight models so i loaded the Dev branch to check them out. I don't know what I'm doing wrong, but no amount of hitting left shift or pulling up on the collective will get the engine to start. I can see the collective going up and down in the cockpit animation, so i know my controls are set up properly and are being recognized. I reverted back and forth between the release version and the dev version, and the controls work as expected in the release version.
I don't see a keyboard command for starting the engine or any of the more advanced startup commands used in TOH, but I'm obviously missing something. This was in the Helicopter scenario, but I get the same results in a Workshop mission.