CFS 3 doesn't support a helo flight model from what I've been told (reliable sources, think it was actually said by LeonR...a dev team member).

Someone could do a "simulated" helo.

Use an extreme stol flight model to get near vertical flight and have it fly like a fixed wing aircraft the rest of the time.

The AI would still have some trouble with it, but not much and you would get around the no support for helo's issue.

Many designers don't like being forced to methods like that so it may not happen. Perhaps if you requested a specific helo, and something relevant to the era?