My own thoughts about the vernier throttle on Bonanzas are that it is the most useless type of control for operation of the engine power setting. The early airplanes had a vernier throttle and a push pull mixture. It should have been the other way around.
Operation of the vernier throttle, in my opionion, is best done with the thumb and middle finger gripping the knob, the index finger extended against the throttle attaching nut to act as a "regulator" of throttle knob rate of movement and the vernier released with the inside of the knuckle of the ring finger.
This allows the pilot to make power changes as necessary, both in total movement and speed of movement very smoothly.
I had an article on this subject in the ABS Magazine in the January 1998 issue on page 5081. The article has a picture of the position of the hand and a description of usage of that position. When I am flying my G-35 and my hand is on the throttle knob it just assumes that position as easy as pie.
I looked up the article on the ABS web site and the picture is clear enough to show the hand position. The ABS Reference Library CD picture and text is very good and easy to see. The hand in the picture is rotated about 120 degrees clockwise to better show the position of the fingers. When sitting in the left seat the "regulating index finger" is at about the two o'clock spot on the nut.
Now everyone has an opionion, and that is mine.
Regards, Lew Gage