That’s a great suggestion! I don’t know anything about master valves yet. I also saw some posts that lead me to understand that some people can run multiple stations simultaneously, so I’d better give some thought to both scenarios.
It sounds like in a master valve scenario, two stations would have to be opened at a time? If that is the case, I could create a configuration directive that allows you to designate which valve is master and then activate it along with the designated station.