I don't know if this will be useful to anyone, but... I find that Miniflux is maybe a little too "minimalist" and "opinionated" for my taste? Anyway, I've got a few Tampermonkey userscripts for it now and this is the first one I've cleaned up.

The other puts sort buttons on the feed page for absolute number of unread entries descending, and unread:read ratio descending. If anyone wants that one I'll clean it up and put it up too.