My home makes extensive use of the VRCZ4 zone controllers. I’ve been using them with an older version of HomeSeer (HS2) for several years and am now upgrading to openHAB. Moving to openHAB I don’t seem to be getting the full capabilities of these devices. Based on my experience with HS2, I should be able to define a scene for each of the 4 buttons. Each button should be able to control multiple devices, turning them on, off, or dimming them, in any combination. Each button LED works independently. And each button should be reporting a press back to the Z-Wave controller, so openHAB can take action on a button press.
In the Z-Wave binding (I’m running a new install of openHAB) I only have one scene thing, and it is 255 if any button is pressed on the left side, and 0 if any button is pressed on the right side. On any left-side button press, all 4 LEDs turn on; and they all turn off on any right-side button press. And, I can assign other Z-Wave devices to each button, but I can only turn them on with a left button press, and off with a right button press.
I can provide more specifics if you like. I’ve added several of these to my network, and they all have the same configuration parameters.
If the full functionality of this device is still in development for this binding I’d be happy to be a test case for you. If there are modification I can make to the .xml, I’m game to give it a shot. I have over 15 of these in my home, and without this functionality there may be a mutiny in the house. 
Thanks,