Setting that DTH creates extra “button” devices. You’ll see the “Tap ^^” and “Tap (down down)” buttons show up in the device, allowing you to simulate a double tap for testing.
From the “Configure” screen (cog at top right, in the Classic app only), you can set up association groups, which create a direct link between the switch and a controlled Z-wave device, without going through the hub.
You can also set up standard automations via Smart Lighting, Routines, etc., using the double tap as a trigger.
For best responses, ask any further questions on the release thread for the DTH rather than creating a new thread.