As to accidently engaging the hydraulic test switch:
Boost disabled, controls stiff;
Caution panel segment illuminates;
The horn blasts.
I find it hard to believe that disabling the control boost inadvertently would be more than a transient problem. The aircraft would tell you in many different ways, that the button you'd just pushed wasn't the landing light.
Had an occurence of servo transparency yesterday- cruise flight, vulture sails into path, left bank and descent, resistance to roll back to horizontal. This was not an aggressive maneuver. It's so common I barely recall the circumstances.