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It would be great to have the option to enable "Observe Heroes" for the entire game, with rollbacks when an object is captured by either player. The blue player would see the red player's actions from the previous day, meaning not during the red player's turn, but the day before. The red player would see the blue player's turn as it should be. If the blue player attacks the red player during the red player's current turn, the game would roll back, potentially interrupting the "Observe Heroes" for a day or two, and then resume after the interruption.
Or, at least, add a button to enable "Observe Heroes" for the current day.