Been playing with this idea as well, albeit with just a switched output. I don't know how the professionally made switches work, I got mine working just fine with no lamp attached, soon as I put a lamp on the ESP8266 would reset periodically, so I haven't installed yet - I assume because of some RFI on the antennae. Tried relay, thyristor, disabling capacitive switch, still does it, very frustrating. Oh, and I get to play with 230V, more care needed!
Be interested to see how you get this resolved.