@aorth This is exceptional functionality that we came across yesterday right before seeing the blog post today and started implementing - thanks much for the documentation, we just got links working after reviewing. IMHO this is the greatest feature we’ve come across so far in Wave 2 (aside from getting the barcode scanner back into relevance search in the mobile app which was high priority for us).
We enabled this by exporting the app in a new unmanaged solution, adding the app setting to the customizations file in the xml, and reimporting.

We already have integrated this into our notification flow for notifying queue members according to their personal notification settings that we’ve added (choices of any/all: in-app, push, email to sms, email).
Additionally, we have a number of items on our dev board to tie numerous additional existing flows and plugins into these notifications.
Very well done team. cc @JeffCarma