I don't think he means all the time, I think he means just when he leaves it on after turning the car off.
I recently got a remote starter installed and had the installer check it out. He basically said that they are both controlled by computer chips as the wires are data wires, giving pulses. They aren't regular on/off wires so the remote starters can't be wired into them.
The only way would be to program them, or have someone create some sort of chip which would give it the required data signals to turn on... Or you could open the entire circuit up and try to wire into the button area? I have no clue...