Ender is able to see the full battlefield (modulo fog of war) because of ubiquitous faster-than-light sensor technology. But he doesn't control any ships directly. Instead, he issues orders to his subordinates who "directly" control squads of ships.
I've always wondered if anyone's ever made something like this. A co-op war simulation game with instant visibility but divided, frictioned actions. Nothing about it would be technically difficult. It would probably be socially difficult to find enough players.