Much like your version piped into an LMS, it could be used used to create a planet of all of the participants in a course, but set up in such a way that only one person needs to create and maintain an OPML file that everyone else can use instead of needing to manually find and subscribe to a bunch of feeds or worry about missing out on that one feed of the student who joined the course two weeks late.
As an example, here’s an OPML file on my own website (through my following page) of all the educators I’m following who are tangentially involved in the IndieWeb movement. If you subscribe to the OPML file in Inoreader, when I update it with additional feeds, you get all the changes synced automatically.
I’d be interested to see exactly how you’re using Inoreader–particularly the off-label methods. Have you written up any of the details anywhere? It looks like you’re using tags in Inoreader and piping those details back to the LMS so that you can filter portions of the class content?
I recently documented some of my personal use here: Using Inoreader as an IndieWeb feed reader. A big portion of it is about being able to use Inoreader to interact within its interface, but also have those interactions reflected on my own website (aka digital commonplace book) which sends notifications to the original content on the web instead of just leaving it siloed within Inoreader.