Although you aren't redoing the flight model, I really prefer the old/original flight model. The original game is the only flight sim I've really gotten into, and that's because the physics were easy and fun. More realistic models always feel weird and overly hard to control, and the old model really feels(too a newbie) like you're controlling a plane, without weird and stiff controls.
The one thing that I think contributes to this the most is not having the nose of the plane sway back a bit after yawing.
If you make another "arcadey" flight sim, please consider making it a bit less realistic than this.