Make Default Custom File Path safe from directoryCleanup

On http://wiki.civicrm.org/confluence/display/CRMDOC/Directories I came across the following warning:
Custom Files Path
The current "default" setting for the Custom Files directory is below the default path for Temporary Files. This is potentially dangerous, as running the directoryCleanup debug action could delete all custom files. If you are using custom files, you should modify the path so it is NOT below your Temporary Files directory.

I haven't tested if this is the case, so don't trust my affected version.

The default should be changed so this danger is avoided. When the danger is no longer there, this documentation page should be changed to remove the warning.