In the SDL Docs Storage Layer configuration parameters
Rather than providing hardcoded values in your Storage Layer configuration file, cd_storage_conf.xml, you can specify strings of the format ${PROPERTYNAME} instead, where PROPERTYNAME is the name of an environment variable or of a property whose value you set when running a script that uses the Storage Layer configuration file.
It is easy to copy any update config files with PowerShell, the files can easily be protected with NT file system security, its simple to check on your configuration by reading the file.
I cannot see any benefit of this additional complication of moving the configuration values, did I miss something?