Let's say you're helping someone to learn the game, but they are overwhelmed by the cockpit, and struggle to find buttons in time.
My idea is the ability to be sort of a helping hand that can "spectate" in the cockpit, highlighting buttons, or even help evert disasters by taking control.
This differs from being a copilot in the t-55 because the way it is now requires the player to already know what to do at least theoretically.
This could also work in single player to a certain extent when the person learning is in the same room as you, and using the pc screen, the guide could at least mark buttons.