Once contact has been made with the CB, nothing else can be changed. How we stoke will change the effects of the CB though. And I believe this is what Billy Bob is saying which is correct. The stroke does change for specific effects on the CB.
It is how we drive the CB that gives us the needed draw. The one example I gave when drawing a CB on a corner pocket cut shot and the CB hits the side rail and shoots down table is a feel shot. Based on table playing conditions, that the player is sensitive to, and then how much drive to the CB allows the player to determine how to not only avoid the side pocket scratch but also what part of the side rail the CB will hit.
Contrary to what many think, if you dig the CB into the felt on a shot, you will get more action because there REALLY is greater contact duration. It is physics and it happens. The best example of this is a masse shot. The CB is held steady for a longer period of time while the tip is driving through it. These are stroke shots that vary from the normal one.
This is why the correct method to draw the cue ball is not by simply lowering the tip, but also raising the back hand very slightly. Doing this makes the draw shot effortless and the distance more manageable. Lowering the tip only will produce a draw but will also resiult in the CB skidding at times making the distance the CB returns unpredictable. Most of the time the draw shot is a dig shot.