That looks very interesting! I use a 12+1 color palette to color cables according to their function. For color assignment I am currently using STROKE from stoermelder. Each cable function (or cable color, respectively) is assigned a letter that I defined in STROKE. If I want to color a wire, I point to a connector with the mouse and press the corresponding button, e.g. ‘G’ for GATE etc.
EDIT 2022-02-09: In the meantime, an awesome, handy module by INKLEN (Nick Feisst) is to come, which makes the management of VCV Rack cable colors a lot easier and clearer. The above palette and its keyboard mapping are also included. Stay tuned!
EDIT 2022-03-09: The plugin is now available in the VCV library!