while playing a game, calculate highest possible score.
calculate highest score you could get if you got all strikes.
I agree with this suggestion. I always like to know what my possible score is if I punch out. Currently I go into the game and score a 300 before I start, then start at the beginning and change the score appropriately and it tells me the score as I go if I were to punch out because I previously marked the rest of the game as strikes.