Suggestion / Idea Multiple user data and more flexible diffuse

[Chua Polar]

Currently, there is only one Vecotr4List userdata provided and all the terms of each vecotr4 will be manipulated by the diffuse. 
However, I want to use the userdata for different usages, like temperature and fluid number(like fluid1: water, fluid2: lava, fluid3: wine......) at the same time.
It will be great if you can either make diffuse a vector4 or make the userdata a List of vector4list with multiple diffuse. Really thanks!