One that I’d like to see is a more in-depth sorting option for posts (allowing you to see for example top of December 2020, or top of a specific day). A custom date range selection would be best. I remember this being a frequently requested feature in the early days of reddit, and they never implemented it.
The intent is to give subreddit mods a place to host information. A notable example leftists here might be familiar with is /r/Sino with its “debunking fake news about China” pages.
It’s nice to have, but you can just as easily do the same with posts.