Teacher's Pet is an EM that I looked around for a while before finding a nice one. The game play is really great and fast. One thing that bothered me from the get-go was the way the progression for the drop target scoring was set up. Basically it progresses from 50 to 500 points as you spell "Teacher's Pet". The problem is that once you have spelled it fully, the drop targets become "Special" and score no points. Add to that if you already have the "S" and "P" early in the game you skip right over 400 and 500 and go straight to Special when you get the "R".
So long story short, the way the scoring is controlled, this can be modified very easily. The Special relay has three normally closed switches. By jumpering closed two of those switches, it leaves the 500-light and the 500-point scoring active along with the Special, so you get both for hitting a drop target. Alternately you could disable the Special relay which would simply halt the progress at 500 and you would get 500 points and no special from then on. I prefer hearing the knock, so went with the first method.
To me this makes the game more fun and would be much more friendly for tournament play too.