It would be useful to enable setting up a controller on multiple devices such as iPhone, Ipod, etc.
I’m not sure I’m understanding correctly - you’re currently able to access any of your controllers by logging into the Rachio app on iPhone and iPad (among others). Are you looking for something different?
We have our Rachio account on 16 different phones, 6 computers and 4 tablets.
Everyone can be logged at the same time without a problem. You just need to install the app on any of your devices that you want to use to operate or monitor the system with.