On my way home tonight I was thinking of a sweet setup I might try; on the idea of a 3+ speed hub in between the motor and the wheel sprocket on the left side. I knew before hand of internal geared hugs, but visualized a problem installing a 2nd gear onto the hub. I was thinking of this in my mind, exactly as pictured but with the freewheel option instead of the coaster brake. That was the first picture that came up when I googled it. It comes from http://www.industrialbicycles.com/hub_options.htm So I think the left it comes from the crank, on the right it goes to the wheels. So its a common enough product. Now where does a guy buy this. It will be some fabriction, but if the price is right, should beat a jackshaft.