I’ll be following your progress with this. Pleased that @urman is looking into it at ST HQ. I’ve been playing with ideas on controlling the water supply in my RV with ST. I was planning to hack an Orbit valve of which I have many laying around. The valves I have require a 3 VDC + or - pulse to open/close. Tricky to do this. What I like about the $40 valve you posted is it’s battery powered and that aligns with my Smartthings in an RV project goal.
What I am most curious about and maybe soon you can help answer it, can the valve dial be left in a position that allows for a zwave on/off (open/close) command set to be used? That’s all I need it to do.