It’s a little cludgy because it’s a hack, it really only works well on lemmy.world. There is a new API end point in the next version of Lemmy though, and Voyager will use that if your instance is upgraded.

Yes, on the next release! I requested it a while back and it was implemented, but it just barely didn’t make the cut for the current release

There’s no random NSFW (yet), but you can get random for local communities, which would work on an NSFW instance