Zwave tweaker is a custom DTH which can be used temporarily with any zwave device. All it does is expose all of the parameters and association settings for the device. You change those to be what you want, and they will then be stored in the device itself as long as it accepts a configuration command. Then you switch back to using your regular every day DTH for that device
So you can do it with the tweaker or you can do it with your own custom code if you would rather.
