One issue with engines with cruise control would be they'd go to max throttle when the motor was disconnected. So, when it was reconnected, they'd leap out like the old Odyssey lurch starting up again. Maybe adding a TDR would help with the jump...
Keen observation GRJ. The most direct implementation of a motor cut-off would be a relay. But to your point, when the relay switches the motor back on, it would jerk, lurch, whatever. What I was thinking was the motor cut-off switch would be implemented with a transistor. This was primarily because of size since a power transistor is many times smaller than a relay. But more importantly a transistor can be configured to "slowly" turn on rather than a relay's on or off choice. So a relatively simple circuit could ramp up the current to the motor over, say, several seconds when power is re-applied to the motor.
As with Dale's comments, this would be a YMMV proposition since no doubt there is a motor drive board out there which gives up, shuts down, whatever, if no motion is detected when applying full-power to the motor.
