Great! That looks like a cheap n easy solution.http://m.harborfreight.com/router-speed-control-43060.html
If you could figure out a way to do this it would be great. I run my 1/2 drill on a monster mill and just zip tie the trigger all the way closed. It runs much, much faster than it should which shreds the husks.
I picked up this link from a previous forum post. It might be helpful for the zip tied drill. -T
Has anybody tried using something like this to control a drill for a grain mill?
Routers are high-speed low-torque and router controls work great with that. On drills, in my experience the voltage drop kills the torque. You can use that but will also need to slow the rate of grain feed. There are also low-speed high-torque drills on the market. $$$ as the inexpensive ones look shabby. The one thing the router control does well is being a convenient on-off switch.
Long term, some some sort of gearing with a decent motor would be the way to go.