Hi
I don't have global solution for your request, but in cases when I need to control the same kind of parameters of different materials (such as diffuse/transc. maps of leaves) I use Bezier Float controllers. Each of them can control some parameter of CoronaColorCorrect map (Saturation, Hue, etc.). So, for example, I Can change Saturation of group of Defuse maps connected to different materials at once. You can see example of this kind of solution on attached picture. In this case SATURATION controller can change saturation parameter of two CoronaColorCorrect maps connected to different materials. HUE controller will affect Hue parameter of those CoronaColorCorrect maps. With this you can group some materials and control them all by changing parameters of connected controllers at any stage of the project.
Workflow:
- create controllers according to the amount of parameters you need to control,
- create CoronaColorCorrect map and connect all controllers to the corresponding inputs
- copy CoronaColorCorrect map as many times as many maps you need to control
- make the maps you need to control go through the created CoronaColorCorrect maps which have the same created in the beginning controllers
- enjoy