When in orbit, there is rarely anyone "driving", because once you're in an orbital trajectory, there is no "driving" needed until a change in trajectory is need

When in orbit, there is rarely anyone "driving", because once you're in an orbital trajectory, there is no "driving" needed until a change in trajectory is needed. When the shuttle, or any spacecraft for that matter, is in orbit, the only times the controls are needed are when changing orbital inclination, changing orbital altitudes, rendezvous and docking, or for the final de-orbital burn. Other than that, especially with the level of ground-based control used by modern space agencies, there is hardly a need for someone to stay in command of the craft during "idle" periods.