Have a look at that Bilenky Viewpoint My wife and I have its predecessor, the Counterpoint. The stoker in front controls only a cadence modulator/adjustor. When my wife got used to my shifting style she stopped needing to use her hand and usually rides with her arms crossed in front. I have all the other controls in the rear. I have even had a RAAM winner in front who had a cast on one leg. She did not even need to pedal as there is a freewheel between the stoker and the captain further back. Ours cost us $2,400 back in 1986. I wonder at the cost of the modern viewpoint. It would definately solve the problem tho.