(Inspired by this question about rudder hand control on joystick-equipped aircraft.)
Most civilian fixed-wing aircraft (post-1987 Airbus airliners being the primary exceptions) use a yoke (essentially a steering wheel mounted on a vertical column that can swing back and forward) to control pitch (pushing the yoke forward pitches the nose down; pulling the yoke back pitches the nose up) and roll (rotating the yoke clockwise rolls the aircraft to the right; rotating the yoke counterclockwise rolls the aircraft to the left), but control yaw via a separate set of rudder pedals (pushing on the left-foot pedal yaws the nose to the left; pushing on the right-foot pedal yaws the nose to the right).
If the yoke were used to control yaw as well as pitch and roll, this would allow the pilot to make coordinated turns using just their hands, rather than having to remember to push with one of their feet at the same time, and would eliminate the risk of accidentally applying the brakes when steering on the ground.
A couple of possible ways for yoke-based rudder control suggest themselves; one would be to tilt the column from side to side (tilting the column left would yaw the nose to the left; tilting the column right would yaw the nose to the right), while another would be to push one of the yoke's horns forward while pulling the other back, rotating the yoke about its vertical axis (pushing the left horn forward and pulling the right horn back would yaw the nose to the right; pulling the left horn back and pushing the right horn forward would yaw the nose to the left).
Here's an illustration of what I've in mind:
Why don't any aircraft use the yoke to control all three axes, rather than just pitch and roll?