It would be nice, but I always thought it was part of the challenge, and kind of an advanced strategy.
Besides, if you play the same difficulty all the time it's easy to know. Most of the ones that give you any decent payout are only like 2-3 mistakes anyway which is pretty easy to keep track of I think. Admittedly if I had it to do over, I'd probably do it that way, but I can't say as that seems like a worth while expenditure of our time. I'd much sooner fix the "pre-loading" of images issue for people with slow connections.