Ideally, I’d like dimming control from the Zen30. But, in reality, dimming from the Zen30 location would be a fairly uncommon occurrence, at least in this instance. I set up as you suggested, and it works well for on/off, including single tap to a medium brightness, and double tap to full brightness. But attempting to random dim/brighten to somewhere in-between doesn’t seem to work. Honestly, this is great and achieves my goals in this particular instance.
The original owners of our house, a log cabin, had a love affair with cheap no-brand stacker switches, so most of the switches in the house are 2-4 stacker switches in a single shallow box. On interior walls, which are knotty pine car siding, I can just cut a hole and use an old work box to add boxes. But for the exterior walls, adding a box would involve a crane and a chainsaw. They also did some, um, “interesting” wiring, so those boxes tend to be about 4x overstuffed with wires by code, especially since they used a lot of 10 gauge where 14 would be customary, and 12 overkill.
Which is the long way of saying, I already have a lot of Zen30’s, this is just the first one in a 3-way configuration I’ve gotten to. There are others, and I’m not sure until I reverse engineer their wiring, which side ends up controlling which when I upgrade them to smart switches.
The Zen30 has a parameter 7, but I’m sure it doesn’t help with dimming. It’s the LED indicator mode for scene control - if I remember correctly without checking the instructions again, whether or not the LED’s show the dim level when controlled via a scene controller like they do when you’re manually pushing the button.
Oh, and yeah, ZooZ support is incredible. That’s part of why I have so many ZooZ devices in my house. Alas, in this particular instance, they got a little stuck, with the response, “Unfortunately, we do not have Home Assistant in-house to provide more specific direction.” It’s not been a problem when I’ve wanted to do odd things in the past. But I’ve also understood the software side of things I was trying to do then…
Thank you so much for your help!