Actually for many off road handcycles they controls are separate. http://officinecubo.com/wp-content/u...07/MG_2231.jpg In this image we see the hand crank being used by one hand and the steering with the other. For me this type of separation is fine.

Most road handcycles are everything is combined. But both work fine.

Great question.

Lean steering to an extent, it won't lean the entire bike as of now. Things could change as it is built.

The only thing I do not know is how exactly this will feel to me. I may opt to bring the seat up and go for a more car like seating or trike style, and that would let m bring the forks down to allow for more traditional turning. That will depend on the crank placement, if it works as shown then I can bring the front closer to me, and steepen the down angle of the forks.

Sorry about the not being sure where things will end up yet.