Hey @compulov – great question – it’s definitely not a stupid one.
The original spec did call for a dumb switch to be compatible in a non-neutral setting, however, on June 13, we found out this was not possible and updated the page (and hopefully sent out an email about it). There was a communication issue where the engineer thought that no-neutral meant no-neutral in the smart switch gang-box only! Whoops… not good.
In fact, the manufacturer also said that day that even aux switches wouldn’t work. I don’t think I’ve ever been so upset in my life outside that day.
However, we kept pushing and had a hunch it could work with GE or HomeSeer’s aux switches if we wrote some logic in the firmware. After a ton of trial and error, we did manage to get it to work a couple weeks ago.
So, while we couldn’t figure out the dumb switch situation for non-neutral settings, we are still happy to report that you can use an aux switch.
We looked at a few other solutions that other companies use, but found that they haven’t figured out this issue either and they use a remote for their secondary switch and pair the two together.
Hope this helps!