It occurred to me that while being able to steer using thrust is perfectly fine in Cosmoteer, there is no reason why gyroscopes can't exist.
A gyroscope in this game would be an internal room (probably 2x2) that allows a ship to rotate around the gyroscope. Multiple gyroscopes working in unison rotates the ship around their average center.
Gyroscopes could be about on par with Standard thrusters in terms of energy consumption, but only provide the force of a Small thruster.