Bill,
Thanks for bringing this up. I can certainly see your perspective. A couple things of note. Currently we do not have the functionality built into the software to run more than one zone simultaneously. That is not to say that we won’t be able to in the future, as we can always tweak things through software.
As @plainsane described you can install more than one zone into a single slot on the Iro. Then you would be able to control more than one zone. The one thing of note is if you have a Master Valve this would not work as the Iro would be triggering the master valve and the other two zones at the same time and the Iro cannot run three valves simultaneously.
Let me know your thoughts.
Thanks for chiming in @plainsane. Much appreciated.