There is a thread in which this is discussed here:http://www.avsforum.com/avs-vb/showthread.php?t=730522
The last few pages has people complaining that this won't work right. I was looking for the same info, as I have a Harmony 890PRO remote and am about to install a bunch of Vizia devices.
I was disappointed people are having issues. I had an idea which may or may not work. If you have an IR Blaster (or whatever the Z-Wave to IR bridge is called) can you program buttons on the remote to send commands out on IR?
If so, you might be able to work around the issue. The Vizia scene and zone controllers have IR receivers which are intended to match an optional IR remote from Leviton. Might it be possible to control the zone and scene controllers that way?