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I recall someone was working on a JCM to fix this; was it you?

I remember that, but don't think it was anyone in this thread started it... it didn't get anywhere, anyway... I don't think.

I have thought of getting the Perfect Arms product to try out with V4WM, on this point...

However, looking at the animation in the product description it probably wouldn't do the job... as it seems to be correcting the movement of flesh on the inside of the elbow joint and not the issue with prominance (or lack thereof) of the elbow bone.

The former, the inside flesh, is dealt with pretty well by the weight mapping in my opinion... its the outside, elbow bone that arguably needs an additional, small morph / JCM to help it jut out when the elbow is bent...?