not all z-wave devices are automatically supported, but most classes of device have templates now. your best bet is to look and see if theres a template for it or a similar device from another manufacturer, or look in the source code for support.
it would help to know exactly which device you are looking at too. if its not supported, we can suggest one that is.
This specifically was what I was looking at, but not because its got a craptonne of features. http://store.homeseer.com/store/HomeSeer-HSM100-Z-Wave-Multi-Sensor-P438.aspx
Mostly because it does temp sensing, and if set up you could use it to turn on a local heater for a room to manage the temps.