I tore my shifter console apart one day to try and figure out a way to do it using the shifter, and the only way I could see to do it would be to use an Infrared sender/receiver combo for each gear step. When the light is broken, a relay goes on, and that is how it know when to shift. Then to operate in TCU controlled mode, there would have to be a relay (or two) that switches the wires to the tranny back over to the TCU. Basically, something would have to be hard-wired in.
I thought of the foot switch(es) because it seemed like a moving target on the steering wheel would be tough while Auto-crossing, and since I have a spare foot... why not? I figure I could use something like those old-fashioned highbeam/lowbeam switches from old American cars. They are cheap and you can get them at a car parts store and bolt them to the floor. I figure one for upshift and one for down shift. Not pretty, but it works, you know? One on the left, one on the right, I figure I could get used to doing it that way. I am sure there are other ways to do it, but none so simple... thoughts?