This sounds like something I discovered regarding multiple skill shots. Did you know you can collect both super skill shots on the same ball? Shoot for one on the initial launch. If you collect it, the next time you are in the shooter lane, hold down the flipper for the other one. If it auto launches or if you have to punch it doesn't matter, the second skill shot will be available. I've noticed that sometimes the super warp skill shot does not light but it will still award if you hit it.

Variations:
If you miss your first super skill shot, you can try for that same one again the next time you are in the shooter lane.

If you make your skill shot, I believe that skill shot is locked out for the remainder of the ball.

Sometimes this just doesn't work (the gates just don't open), but more often than not there can be multiple skill shots per ball. I haven't determined the pattern that makes it not work sometimes.