Ok, I see your point about wanting to "turn the key to ACC" vs. actually starting the car. Maybe you want to inflate your tires and need power to the outlet.

Also I really don't like the idea of 3 "pokes" of the button to start the car. As was stated I think this moves very far away from the intent. Plus I will feel like I am priming a lawn mower, not trying to start a car.

I think holding the button for 1.5 seconds sounds like a good compromise. It is not too long but still gives you plenty of time to activate "ACC".

So that brings a question. If I have turned my car to ACC and want to start it a couple of minutes later do I just hold the button for 1.5 seconds or do I have to turn the car off and then hold the button.

I would say you should just have to "poke" the button to turn the car off but it should only turn the car off if it is in park.