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Electronic cruise control would be very easy in an electric car if you could figure out the control parameters of the inverter.  What you are after is getting the inverter to output a specific frequency to the traction motor to hold it to a constant RPM.  Cars with transmissions that shift (or have a torque converter that slips) need a more complex system to regulate the vehicle speed because the engine speed could vary based on load condition.  Our electric motor is directly connected via a speed reducer to the drive wheels, therefore the ratio between the motor frequency and the drive wheel speed doesn't change.  The primary business of the company that builds the inverter for the I-MiEV is manufacturing industrial variable speed motor controllers---exactly what you would use for cruise control.  I believe the cruise control in my LEAF works in this manner.  It is very good at holding road speed to within one or two MPH.  For the small number of I-MiEV's on the road, I wouldn't expect anyone (except someone on this forum) to go to the trouble to research this.