Since you have one master switch working, one option is to use aux switches in the other positions that are not actually on the same circuit at all. In fact they can be battery-operated if you like.
They work by sending the request to the smart things hub, and then the hub will send the request to the master.
The tablet idea is good too, or you can use a $20 Wi-Fi phone which is a little cheaper.
So it just depends on aesthetically what you want to use and how you want to work it. And whether you’re OK if the auxes don’t work when the ST cloud is unavailable.
We’re all waiting to see whether the new Phillips switches will work as a button controller for smartthings, if they do that will be another option. But it’s early days on that one, they just came out.
A lot of people like the look of the Cooper RF 9500. So that’s one option for a battery powered switch.
