Made a mistake with the name.
https://help.maxon.net/c4d/en-us/Default.htm#html/TMGWEIGHT.html?Highlight=MoGraph
My mistake , I take it back. They already have that implemented. It's just that it's not as straight forward as the other tags. You select the tool, then just click any instance and then the Tag is created. Which with only one click will open the attributes or else will revert to the tool attributes.
Hmm... still doesn't work though.
It doesn't translate the MoGraph weights to VertexWeights.
I don't think this is a bug. It's just not built to work this way.
Well of course it doesn't !
I'm applying it to the Subdivision object ! Still doesn't work but if it did the VertexMap tag should also be assigned on the Cloner.