There's a whole slew of work being done on neurogical controls to assist the handicapped of every sort, do some googling on combinations of "handicapped", "neural", "computer", "controls" etc.
"...the electrical nature of the human nervous system will be the basis for direct neural control of computers. The neural interface refers to a direct data link between a computer and the human nervous system. The user can control the activities of the computer directly from nerve or muscle signals without the need for a keyboard or mouse. 'Someday it can even be possible to think a command and the computer will interpret and execute the thought command via neural interface' - as seen in the "primitive" version for Kris Rytter with her Alternative Communication System." -
http://www.mala.bc.ca/~soules/media113/utopia2/kerem/utopia.htm
"... Phil Kennedy, a neuroscientist and CEO of Neural Signals Inc., has successfully fused the human brain with a computer. By strategically placing a handful of electrodes near a few good neurons, Kennedy has allowed his patients to write words on a computer screen just by thinking about it. Future patients endowed with subcranial cortical implants, believes Kennedy, will learn to use signals to control what they want. As researchers such as Kennedy are discovering, the flexibility and adaptability of the brain is astounding." -
http://www.sentientdevelopments.com/disabled.html
The critical issue, as I see it, lies in convincing the researchers with the big government budgets that steel guitarists are physically impaired or mentally handicapped, because they can't make their instruments sound the way they want them to. This might be a tough sell.