Add default value at the global level/plugin's settings page.

rule.php

@@ -86,22 +86,19 @@ public static function add_settings_form_fields(
                     0 => get_string('notrequired', 'quizaccess_honestycheck'),
                     1 => get_string('honestycheckrequiredoption', 'quizaccess_honestycheck'),
                 ));
+        $default = get_config('quizaccess_honestycheck', 'honestycheckrequired');
+        $mform->setDefault('honestycheckrequired', $default);
         $mform->addHelpButton('honestycheckrequired',
                 'honestycheckrequired', 'quizaccess_honestycheck');
     }
 
     public static function save_settings($quiz) {
         global $DB;
-        if (empty($quiz->honestycheckrequired)) {
-            $DB->delete_records('quizaccess_honestycheck', array('quizid' => $quiz->id));
-        } else {
-            if (!$DB->record_exists('quizaccess_honestycheck', array('quizid' => $quiz->id))) {
-                $record = new stdClass();
-                $record->quizid = $quiz->id;
-                $record->honestycheckrequired = 1;
-                $DB->insert_record('quizaccess_honestycheck', $record);
-            }
-        }
+        $record = new stdClass();
+        $record->quizid = $quiz->id;
+        $record->honestycheckrequired = (empty($quiz->honestycheckrequired)) ? 0 : 1;
+        $DB->delete_records('quizaccess_honestycheck', ['quizid' => $record->quizid]);
+        $DB->insert_record('quizaccess_honestycheck', $record);
     }
 
     public static function delete_settings($quiz) {

settings.php

@@ -0,0 +1,37 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Implementaton of the quizaccess_honestycheck plugin.
+ *
+ * @package   quizaccess_honestycheck
+ * @author     Sumaiya Javed <[email protected]>
+ * @copyright 2011 The Open University
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die;
+
+$settings->add(new admin_setting_configselect(
+    'quizaccess_honestycheck/honestycheckrequired',
+    get_string('honestycheckrequired', 'quizaccess_honestycheck'),
+    get_string('honestycheckrequired', 'quizaccess_honestycheck'),
+    1,
+    array(
+        0 => get_string('notrequired', 'quizaccess_honestycheck'),
+        1 => get_string('honestycheckrequiredoption', 'quizaccess_honestycheck')
+    )
+));