Sorry for yesterday that I have posted the wrong place.
I have tired the new firmware 2.41b4.
I found the "Yaw follow" is very slowly back to the center position and the angle of backing to the middle position is too big.

For example, If I turn left a little quick, the camera is toward right, the reaction of the camera come back to the left is very slow, at the same time , the angle between the head and camera is a very large(I think it's too large).
When I stopped rotating , the camera will slowly move to the direction that I want.
Maybe I can call it "the Yaw response time" is slow.

So, I think the two functions is really necessary, just as follow:
(1) Angle range limit of Yaw follow.
(2) The speed of Yaw follow control. (Because sometime we need some quick follow )

Or, How can I solve the problem?

Regards,
Bubble.Z