You might also look in to designing a steering dampner to help keep the jerks and jumps to a minimum for a one handed rider.

 

I have kind of the same issue, at birth my right hand was messed up, but I am just like any other guy, I just want to get out there and ride, and I wasn't going to let my right hand stop me! I had tried the gold finger throttle... and all I can say is ughhh! I really disliked it. So about 2 years ago I made my first left handed thumb throttle from scratch. I had access to the tools, so why not! I have begun to realize how hard it is for others to find throttles to help out people with injuries to there right hand so I decided I would start making more for others. I am hopefully going to be selling some here soon, like it 2 or 3 weeks, I'm getting pretty close to being done. There at Shawftware There is also a facebook page that shows how everything is going and the progress on the throttles, You will find all the info at shawftware Hope this helps!