I was thinking of the file:
C:\ProgramData\MSFS Addons Linker/MSFS_Addons_Linker.ini
There are a few undocumented toggles in there.
The following for example delete content.xml, cache folder and scenery folder:
I thought there was an option to delete UsrCfg.opt but now I cannot find it in the file, so maybe I made a mistake.
But this addon would still be a great venue to tinker with that file if at all possible…