I, too, would like to have the option to run multiple zones at once. And my use case appears unique versus the others presented here.
I have lived in my current Austin, Texas based home for 6 years and installed a Rachio 8 zone controller last year.
The house is 30 years old and has 5 zones across 1/3 acre. It only has 2 zones in the backyard.
I recently turned a sprinkled shrub bed into a small garden plot and I want to subdivide the large zone in half. Unfortunately, the garden bed is at a point roughly 60 feet from the existing control valve and splitting the feed line there or somewhere prior to the garden isn't feasible because it travels under steps and a slab for pool equipment (as best I can tell). The garden is the first area in the zone and this weekend I ran a control wire from my Rachio panel to a new control valve I installed just after the garden in an easily access area under a deck.
My plan was to water the garden more often than the rest of the oversized zone by leaving the second (in serial) valve closed unless I wanted to water the entire zone.
Suffice it to say, that I was very disappointed to learn after my installation efforts that this isn't supported by my Rachio controller.
After reading this thread I fully understand the possible downsides of my approach, but would still love to have it as an option, albeit imperfect.
Are there any plans to develop the software to handle multiple zones being on at the same time or did I naively waste many hours this weekend?
Thanks in advance for any feedback on the product roadmap and any ideas of a workaround to my current frustrating predicament.