ZEALOUS,
The STS 1 is very intuative for most practical purposes, but....

ON/OFF button for the spindle would be very handy.
"GO TO" Fill in coordinates box would be nice.
Slider speed override would be great.
A visual of actual speed (graph bar) extra fluff, but cool.

Audio files would be OK, but I wouldn't be able to hear them in my shop.

Once sorted out, a .doc named "MACH3 STS-1 FOR DUMMIES

!"
With the natural assumption there would be a fee...;

Could you write a custom screen for
my factory machinery?