Does my memory serve me:- that on the B747 crew seats there was a black button switch which needed pressing to pass power to the multi directional switch (up, down, fore and aft) for seat adjustment, this could be achieved by thumb on the button switch and finger movement of the multi.
Safety engineered?
Smiley, B747, we were not allowed to use the electrical seat adjustments during flight!
The noise of the seat actuator disturbed the passengers in the nose section, whom were either 1st class or the VIP bedroom occupants.