Add the ability to turn the Master Valve On Selectively, based on which Valve is On. So, if I want the Master Valve On for Valves 2, 3, and 8, but Off for all of the other valves, I can do so. I am hoping that a software upgrade is possible in your Revision 3 controller.

Master Valve Feature Request

Stewart July 22, 2019, 5:22am 2

You could control the master valve programmatically, with a script that turns it on or off at specified times, or with a relay that enables the master valve when specific zones are running.