For the transcoding setting, they are indeed in the user profile and work since day-1 as inherited from the Emby fork. It does 100% disable all transcoding for this user.

> I have specific content jellyfin doesn't work with where Kodi is fine

Very surprising as Jellyfin is just a passthrough to Kodi. Did you open a bug report?

> I am just sharing my experience with this software package.

Every post here about an open source project be it Firefox or Jellyfin always see plenty of people sharing their experience with it from a decade ago and panning things that actually work. I usually just read them and move on but sometimes I like to give a counterpoint when it’s about a piece of software I consider quite good.