I have been riding a Freedom Ryder lean and steer for 12 years and find that handling is superb. It corners and feels more like riding a bicycle as the rider leans into the turns. The use of an adjustable steering dampener, as many motorcycles use greatly improves stability.
I rode bicycles until 20 years ago, and motorcycles until six years ago. I also mono -ski and ride an Explorer II off road hand bike. The best design for a handcycle would be two wheels in front and one in the rear as most off road hand bikes use.