No to all questions... except maybe aftermarket, but haven't heard of anyone having done so, or even seen any kit available.
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ACC will stop the car if the car your behind gradually comes to a stop it should then take off on its own but not after 15 seconds and resume the set speed chosen, ACC will not stop in an emergency will only apply a brake pressure which will gradually build up the closer to impact and will warn driver with dong's from dash brake pedal will also vibrate. In the end it's an assistant which is brilliant for highway driving even works well around some city roads. These are just some of the features of ACC buyer should look into all other functions, Highly recommended!!!!!
5FWD - VW Phaeton Team Test video from Fifth Gear - Skip to about the 2minute mark