Motion Paths long computation issue with BlenRig and feature request

We are working on a film and trying new Blender 2.8 for animation. We are in testing phase and had some issues with motion paths in combination with BlenRig, We would like to address that motion paths calculation works faster on single object with simple scene but it takes longer time with complex rigs like BlenRig. We would like to suggest following improvement and feature request to make animation process faster:
Current issues:

  1. One thing we found out that motion path doesn’t change itself when we modify the animation curve in graph editor. It works fine when we update the motion path.
  2. Auto update is buggy. Sometime feeback is instant and sometime its not.
  3. Object also doesnot snap itself to updated motion path . You have to slide it in timeline to see the effect.

Feature request.:

  1. It would be nice if it auto updates itself.
  2. It would be nice if motion path can be switched on/off like other 3D packages instead calculating which leads to waiting a lot.
  3. It would be nice if we can modify the motion path directly from 3D view port not only on keys.