Yes, to both of those questions! 
interi is my catch-all, and that line was a challenge to make folks think about it. I wanted to point out that I’ll move my media posts into the new bucket category.
I love this, and want to know how to do it. I have my own system in the hypothetical works, based on my experience with ecommerce and handling inventory. But of course a simple timestamped log works. You are encouraged to experiment with those posts, so we can see how it plays out.
If we ever created a category specifically for tracking stuff (and we have so many tools to assist, templates and external forms, I even have a form wizard right here on Discourse site that we don’t use because it is kinda weird and I have nothing to do with it), I envision it as a sub-category of The Life Raft. Tracking communal resources in an inviting and fun way seems like a great way to show folks the alternatives.
Honestly, me too. Here’s the thing: you are a candidate for TL4 (if @tim and @trashHeap don’t block ya [ha, made that up, but again putting it out in the world that one human is making big decisions for this public comms store!]), and that means you gain Mod-like powers! ((Hahahahaha! Mod-like!))
But Discourse breaks up all of what I’d call “capabilities” into a couple or more security models. It isn’t exactly like, um, a mainstream CMS or file permissions.
However, I do want to be able to carve out little niches in categories, and there is a group mechanism; I don’t think it would scale if we wanted to open it up and let anyone create categories, because there are manual components involved. However, since we are slow I think we should consider offering one or more “groups” to each category, for further splitting permissions.
If that last paragraph doesn’t make sense, it probably will later (or not! I’ve not spent a lot of time on these! 
).
One particular use case I am interested in is having an email address mapped to a category, and use moderation. I’d like to have a member of our community to spot check new posts from outside, and have no barrier to posting by members. Not for every category, but I think that would be great for Slow Tech Support.
Whatcha want to call it? It’s your Queendom/Tyranny/Republic/Anarchist Utopia/Whatevs!