Upto about 5 or so years ago I can't think of an ABS equipped car I've driven without an ABS button. I'm less sure about more recent models as there's so many combinations of traction control, ABS and other assorted gimmicks. With recent winters free of ice I've not even bothered to look. Maybe it was a regulation thing here in the UK. Maybe it still is. :)

I have a sports car with both. Many racers add buttons by adding switches and relays to the ABS circuit, but many modern cars go into Safe-mode when you do such hackery. My scion helpfully disabled power steering when abs went out for some godforsaken reason. For the average driver, removing it would be a manuver in futility and libablity for the manufacturer.