Save to INI File - how to default for installers?

How can the advanced setting, "Save all settings to INI file", be set if doing a custom unattended (silent) installer for CCleaner? Is there a registry entry that can be tweaked to set this?

If there is no way to do this, then why not make a Command-line parameter for ccsetup.exe for this.

You could, instead just download the Portable version

http://www.ccleaner.com/download/builds

in regards to a registry entry that can be tweaked, the INI replaces the need for the registry