From @moodlehelen:

In addition to some security fixes, Moodle 1.9.8 will also include a new capability moodle/restore:createuser for controlling whether a user can create other users when restoring a course (source: Moodle 1.9.8 release notes).

Related:

• Check out Helen’s post at: http://helenfoster.wordpress.com/2010/03/19/moodle-1-9-8-on-its-way/
• The 1.9.8 release notes: http://docs.moodle.org/en/Moodle_1.9.8_release_notes

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