It's Me used rotoscoping techniques where video was added behind the motion dummy and you could trace frame by frame to the background video.
You can do this now in CTA by adding a video to the background or as a background prop. Then by carefully positioning your character in front of the video you can trace the motion frame by frame.
It actually works quite well but I will put forward your suggestion for a dedicated rotoscoping feature.
Peter
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www.reallusion.com