That device only has eight colors, it’s not an RGB light, so that part’s OK.
As far as changing the colors, you don’t do that in the DTH, you do it with an automation or Webcore. It’s definitely doable, people have used that as a notifier before. But you need to have the right DTH to begin with To make the colors controllable. So the capability is in the DTH, but the instruction to change from one color to another is in a smart app/automation. Here’s a DTH with that feature that looks like it’s working with the new V3 app:
[RELEASE] HomeSeer Multi-Sensor HSM200
Not sure what to say about the “No motion” issue, hopefully someone else will know.
Because two of your questions are about automations and I’ve already answered the third one, I’m going to move this thread to automations.