How do you REALLY freeze a Rigid Body (no dragging allowed)?

Hi!

Is there any way to completely freeze the position and rotation of a Rigid Body with connected Rigid Bodies? If I have a chain of several bodies connected with ConfigurableJoint and freeze the position and rotation of the first body in the chain, it can still be dragged by adding forces to the other bodies in the chain (or in my case dragging the bodies with the mouse by setting the Rigid Body position).

It is important that the first Rigid Body is not allowed to move in the slightest while the bodies connected to it are allowed to move as far as their joints will allow.

Rigidbody.isKinematic ?!