More for the games that are finished, but also useful for current games, it would be cool to be able to roll-back in a timeline to see the progression of the game. The idea comes from just not knowing which game it was when the board is covered in one color.
I know you can figure it out from the game log, but it would be far simpler if there was a slider that let you see or even better simply animate on the board the progression of the game, whether just going back a few turns or replaying the whole game quickly. Maybe even a play button with a speed selection, next to the slider.