Yawing is indeed accomplished by "differential cyclic pitch", ie, to yaw left the front rotor banks left and the rear rotor banks right. It's all done by a "suitable system of push-pull rods and bellcranks", rather than electronics - remember the age of the basic design. The pilot input is just the same, through the yaw pedals, and the result is the same, it just does it diffrently.
And like a convential helo, judicious coordination between feet and hands can engender a spot turn around any point, inside or outside the aircraft.
Slowing one down would not be a good idea rhmaddever, as the blades intermesh!!