In the early days of the V Force we did have a system called ACP or accelleration check point. It was a specific, well marked point on the runway by which a pre calculated speed had to be attained. Otherwise, abort. Of course all take offs were from a very specific point with the brakes released just as engines were coming up to full power. Thus, this technique would not work with normal civil practise. When I became a civil pilot it always seemed slightly "gash" to me that such exact calculations were done but that the most fundamental element, the point of initiation of the roll, was so indeterminate in practise.