If he is so concerned with definitions and what the legislature intended, then he should look up and read the actual law.
In the case of Pennsylvania, where I reside and am thus concerned with, it is breastle 75, Part III, Chapter 37, Subchapter B, Section 3731.
"Offense defined.--A person shall not drive, operate or be in actual physical control of the movement of any vehicle:
1. while under the influence of alcohol to a degree which renders the person incapable of safe driving; 2. while under the influence of any controlled substance, as defined in the act of April 14, 1972 (P.L. 233, No.64) known as the Controlled Substance, Drug, Device and Cosmetic Act, to a degree which renders the person incapable of safe driving; 3. while under the combined influence of alcohol and any controlled substance to a degree which renders the person incapable of safe driving; 4. while the amount of alcohol by weight in the blood of: 1. an adult is 0.10% or greater; or 2. a minor is 0.02% or greater.'
No where in there does it say anything about the motor running. Just "...actual physical control..."
Doug