Well, there is functionality and functionality.

As I create photorealistic custom sculpts that are supposed to look like real people, proper scaling is an absolute necessity.

I don't care about Genesis' mesh layout or default sculpting. It's quite lacking, anyway.(Although I do like M5 a lot better than M4)

I want it because of it's superior rigging and scaleability.

It bends very, very, VERY good in Poser. Best feet, knee and thigh rigging I've ever seen.

But I can't start working on it without a way to change the proportions.

 I don't mind hacking the cr2 or going through Studio 4.5 if necessary. But I do need the same full control over Genesis that I have over all my other meshes.