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I would also add a feature to the window where you hire units, so you can see all of them at once, even those you can't hire yet. They could be displayed as if in the shadows, but still visible. Right now, it's just black holes. You can't see what you're aiming for.
Maybe it's not relevant, but I really like the feature in Heroes of Might and Magic V, where you can see in advance during a battle whether your unit will deal damage to the enemy, and if so, how much. It's a great idea. You don't waste magic or a turn unnecessarily. I don't think this was in the previous games, right?