Valid list of folders in ARI voice mail

The valid list of folders in ARI voicemail can easily be changed in the main.conf.php. I was wondering if it is “safe” to create custom entries in this file and have things upgrade without overwriting it? I was thinking about leveraging the script located at http://support.infoarch.com/tools/move-recordings.zip to organize recordings (move into a recordings folder in voicemail) and didn’t want to do something that would be broken with every update/upgrade to the core system. Thanks!

Rob