Pretty cool that this node does not need redeploy to change state! I will keep this in mind.
Ah true but you have to add it and deploy one time to have the dynamic on/off switch - nitpicking, I know 
Cooler would be a plugin solution that can be used anywhere at any time without deploying anything. If someone wants to build this, then a good starting point are the Messaging Hooks : Node-RED but you probably have difficulty stopping a message from propagating ... but where there is a will, there is a path into the future.
Yeah, that's true, but it also support programmatic control (by sending msg.floodgate = true/false) which is another pretty cool feature. Though that does not update the node state in the editor (the toggle button on it), which is a bug I guess (maybe changing the node state requires a redeploy by architecture design?), but this is a bug I can live with.
