I would find a nice feature in CC4 exactly doing this. I my eyes it should be relatively easy to implement because the tools are already there. How about making it possible to import an image into mesh mode as an overlay, let us position and resize it and give it a transparency slider so we can perform the step showing in the video in CC4, not Blender. Perhaps a kind of a static mesh imager layer mode which temporarily does not allow to turn the character for the purpose above, or maybe from a certain angle only depending on the image provided.
