To stop the updated items jumping to the front of the list I wrote this: https://gitlab.com/smaniottonicola/jellyfin-date-fixer.It doesn't do everything you are asking for, but you may still find it useful.
I had a similar experience looking up the code for ⊥, I didn't realize the world has given a very specific meaning to the words "latex bottom"
Jellyfin: The Free Software Media System @lemmy.ml shmanio @lemmy.world 2y ago Jellyfin date fixer (a script I wrote) gitlab.com /smaniottonicola/jellyfin-date-fixer
Jellyfin: The Free Software Media System @lemmy.ml shmanio @lemmy.world 2y ago Standard theme with custom accent color gitlab.com /smaniottonicola/jellyfin-custom-accent
To stop the updated items jumping to the front of the list I wrote this: https://gitlab.com/smaniottonicola/jellyfin-date-fixer.
It doesn't do everything you are asking for, but you may still find it useful.