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Phantom 4 Pro V2.0 - Gimbal moves a few degrees (maybe between 5-10) either left or right as I use the left joystick to turn the craft left or right. Is this a design-feature or can I disable it? It basically doubles your lateral camera movement for a few degrees in either direction.. makes exact panning control difficult.

I can place the aircraft on a table (not flying - props not on) and when I move the left joystick just a little to either the right or left, the gimbal moves right or left by maybe 5 degrees.  

I think there is a setting where you can disable that. I think its the follow FPV. in the gimbal settings

Mine does that too.  I think they all do it.  I think the idea is to counter the abrupt movement of the AC to provide smoother video.  

Yup,  mine also.

IF the settings are the same as for my P4P, on the *camera settings* page of DJI GO app select *FPV Mode*  INSTEAD OF *Follow Mode* and the "dampening effect" will be removed

yup my p3 does that thought that was normal

This is a compensive action of that Gimbal to  record curve flights smoother and protects the yaw axis.

It's the Yaw.  I've tried flying w/ it off day 1 I think the 1st 1/4 or probably the whole video of this flight but it's more difficult because the whole drone has to turn before it moves so small movements were pretty much non-existent but my settings were pretty much at the lowest possible for Yaw.  I put everything back to default and it seems smoother to fly.

It's worse to fly w/ that setting off.  It's like riding a motorcycle with the steering damper set way higher than needed at low speeds.  It makes it very difficult to turn feel wise.