Vertex velocity group - point velocity (weight map)

Vertex group - point velocity (weight map) - vimeo.com/141650974

I think this could be used for many nice vfx.. like generating smoke and particles for fast movements. Btw. I know there is blender everything nodes under development but will it also include nodes to generate new vertex group operators / functions by node editing. it would be handy if nodes could be used to generate something like this (point velocity vertex group) or tension map etc.