Minor It could be very useful to enable the teachers to set the visibility of
the grade's range in the student's report table.
the default is: show
grade/report/user/lib.php line 104
$this->showrange = true;
how about controlling it like this:
$this->showrange = grade_get_setting($this->courseid, 'report_user_showrange', $CFG->grade_report_user_showrange);