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 ability to change Lemmy’s site theme (at least from light to dark), without the need to log-in could be cool.
The default lemmy theme uses your browser / OS settings from
prefers-color-scheme. Luckily a lot of browsers are starting to use this now.