Ever? Sure. Soon enough for your needs? Possibly not. Discourse is still a relative youngster in the forum space; it’s first public release was only a few years ago, whilst IPB’s first release was back in 2002. So it’s not surprising that the current set of available plugins for Discourse are centered around using it for more serious purposes, because that’s where the resources are. As Discourse’s popularity grows, I’m sure that people will make all sorts of “novelty” plugins.
As for finer-grained permissions, the keyword you’re looking for is “category-specific moderators”. There’s been a lot of talk about it over the years, and it is something that will eventually exist in core, but it’s a big feature that touches a lot of places, and the demand for it from our paying customers isn’t as great as some other things, so it hasn’t yet been implemented.