Accesses an user database inside of the ewiki database as _SYSTEM page
"system/passwd". This page/file has a format like the UNIX /etc/passwd
file; but contrates on usernames, passwords and ring/perm levels. The
format of this ewiki page/file is described in the plugins comment.
The _SYSTEM flag of this ewiki page/file requires an administrator user,
which is the only one allowed to edit the "system/passwd" contents.

To create (or edit) the page 'system/passwd' you will need to enter the
appropriate URL manually: ".../wiki.php?id=edit/system/passwd", because
the slash in the pagename makes it somewhat harder to find (ewiki else
believes the "system/" to be an action parameter).
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You cannot modify the ProtectedMode file, but anyhow any ideas or suggestion should as usually get filed on BugReports, UserSuggestions or even better the ProtectedMode.Discussion.