Functional Request:
I believe being able to select a primary device from HS3 is super important since realistically things like door/window sensors etc I would think most would want to have a specified primary device of something like the open/closed status and would want that to reflect globally to their users as constantly getting a hold of other users phones and setting this up for every device each time is painful.

As part of also making that less painful I would think we would also want that function in the HS3 device management section where when you select a device from the left hand side you could then go to the top from the drop down box and say "Make Primary Device in Mobile".