If I turn on the accessories mode to listen to the radio or (more commonly) to play with some setting I've read about on these forums, is there a way to turn the car directly off, or do I have to cycle in to the Ig-On mode first?
Yup, that's the way to do it. One of the disadvantages of the power switch vs key ignition. Now if there were a way to go from Ready to ACC without shutting the radio off. I listen to the radio for a couple of minutes while I get the mail, and I don't want to leave it on ready. I am usually listening to a talk show, so I don't want to miss anything. Maybe they can have it go to ACC from ready if you don't press on the brake when pressing power?