I used to do games for years, and I have actually seen more instances than you would think of the score keepers recording the numbers incorrectly, especially if it is the same person running the clock. I'm not sure how much more efficient it is with the iPads now, but having 1 person running the clock and the other person doing the scoresheet always seemed to work best as far as accuracy. Teams already supply someone for the penalty box, and clock... it shouldn't kill another parent to volunteer to do the scoresheet. My guess is that the same parent that is going to complain about a mistake on the scoresheet is also going to be the same parent who complains about having to volunteer to do it.