Great topic. I just hope thinking about it doesn't stuff me up! When first learning a game I concentrate on what angle the ball has to leave the flippers to hit a certain target. Depending on ball speed the timing has to be adjusted, but if the ball gets sent off on the right angle it will hit that target, and you've got to watch to see if you were a bit early or late or spot on. After a few bullseyes I start to get to 'know' where that particular target is. After that it's practice, practice and of course some shots are harder and more fun than others.

Maybe some markings or after market stickers would help.
Probably been done already but if not I'll take the patent thanks!
Will try it, and see if it's helpful or distracting.

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Yeh, just an idea, sooner or later youre going to need to learn off by heart where your flippers are. I don't see people putting lines on baseball or cricket bats. I just tried stickers on my Ackadacka machine and found them to be more of a distraction.