Resize limbs to add body fat for better character creation workflow

How do I scale the size of individual advanced puppet joints without touching the length of the limbs as in the sculpting anatomy video by kareem. I know I can drill /scope fully in and adjust the key components individually but this is laborious and sculpting the body fat is Slow in comparison when just wanting to quickly test puppet proportions. In the video the sculptor seems to use a variation on the resize twist gesture but I cannot find any info on how this is achieved. This appears to be a really KEY feature for work flow that has been removed from early release. I hope that it is there or will be put back in