I know the Wiki-Page about the topic. Is there betteranother one?
There is no info about where the config should be written. And no info about if it is able to run Kodi with a different uid. Because with LibreELEC 8 and Kodi 17.3 it looks like that kodi runs as "root" (uid=0).
Do I have to give Kodi root-rights on my NAS to access an NFS-share from there? I won't.
Or can I modify the Kodi users itself?