As far as any one has ever been able to demonstrate (to my knowledge) the amount of swerve you get depends on the angle of elevation of the cue stick. For years many believed incorrectly that it was just the side spin that caused the ball to swerve. Coriolis's rule also says how much draw and amount of side affect the total angle of curve.
This principle says says that if the cue stick is actually horizontal, there will be no curve. It is very, very hard to have a horizontal cue stick for most shots because the rail is in the way.
The principle also says that if you have a negative elevation, you can get the cue ball to swerve away rather than towards the side of english. I think this has been described in print but I can't find a reference right now. One demo:
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The cue ball is up on the rail and you shoot up on the ball with right english and about 45 degrees negative elevation. The three balls are in line. The cue ball curves to the left around the ball in the middle of the table and then hits the cushion and comes back also to the right of the ball in the middle of the table.