This machine would probably have a clutch motor. Any industrial sewing machine can be retro-fitted with a servo motor.
In most cases, they bolt right up to the original mounting holes. A clutch motor is either on or off, and a servo motor is a constant torque motor with variable speed.
As far as reverse goes, it is a nice feature to have, but not essential. If you're only going to do a little sewing, you can lift the needle, move it back on the seam you just sewed, and sew over the top of the original seam. The whole idea is to lock the end of the stitch line down, and this method will accomplish that.
No one lives forever, the trick is creating something that will.
Last edited by DanTwoLakes; 10-10-2007 at 07:54 AM.