My driver supports the feature you need (or at least I think it's the same thing), feel free to use it in your drivers:
Btw. FYI I decided to abandon these devices, because after a small power outage my relays fell off the mesh, and I had to rejoin them. It happened to me 3 times... still looking for a replacement, but it seems I will use an Orvibo relay where local control isn't a must: [BETA] Orvibo Zigbee multi-functional relay (RL804QZB) driver
