The spirit of my reply was to support your wish, rather than to pick fault in it - so don't knock it.

But no, unless I haven't read the instructions right, I've had factory fitted Volvo, Range Rover,Suzuki,Honda, Audi, M.G., Ford, Jaguar, Citroen and Peugeot head units and aftermarket Panasonic, Sony and Kenwood without such a button.