What is the best way to control all joints on real time

Hello! I am trying to animate Character model using my animation scripts that control joints using input from motion capture.

I used controlJoint() for all joints and changed the matrix of the joints in the scripts. This works well.

And then, I am trying to control the joints using multiple scripts (ex, lower and upper body scripts).
To do this, I think blending some joints is required, but Actor can be blend only animation.

So, I have several questions:

  1. Can I use ActorInterval to control all joints using inheritance? (like controlJoint() with script)
    (And is this proper way?)
  2. Can the ActorInterval be used for blending?
  3. Or, is there another (better) way to do this?