Node-RED is really a very impression project. I really enjoy using it.
May I request a small feature for a future release (if if you have and it fits into your plan for the product)?
Please add the ability to multi-select wires in a flow, and after selecting them (with the mouse of course), add a control-click key which pops up a color picker which permits us to select a color for a one or more wires.
This feature would make it easier to read more complex flow diagrams where we have a lot of wires, sometimes coming out of busy nodes and connecting to other busy nodes, crossing over, etc.
It's not really a "must have" as Node-RED is already like the bridge of the Starship Enterprise; however, this feature would not be hard to add (I am guessing) and would add a lot of value to developers who have complex projects .
In addition, when taking screen shots or making video presentations of Node-RED projects, the added ability to manage the colors (and color groups) of the wiring would enhance user presentation and readability.