Hmmm. I know your position very well about what LE should do and what not. And looking for LE as a "firmware" I love it because it just works out of the box, and that is the reason why I am not enthusiastic to do everything on a plain linux installation with days of configuration and updates. You really do an excellent job ! But there is only one more thing........: beeing able to use an additional user with readonly rights while root/libreelec (OMG? my family doesn't read this ) has full access.
I will do some test....