Perhaps a way of removing hydraulic power to the actuator in an emergency as well?
The TR pitch control linkage of this aircraft looks insanely complicated and convoluted to my untrained eye - so many linkages, pivots, rose joints, cranks and other components: they must be a nightmare to maintain and keep working smoothly and check during the pre-flight inspection?
Seems bizarre to have only a single yaw control system, which if it fails will guarantee a crash.