Index: admin/settings/server.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/admin/settings/server.php b/admin/settings/server.php
--- a/admin/settings/server.php	(revision HEAD)
+++ b/admin/settings/server.php	(revision Staged)
@@ -42,6 +42,9 @@
         new lang_string('pathtopdftoppm_help', 'admin'), ''));
     $temp->add(new admin_setting_configexecutable('pathtopython', new lang_string('pathtopython', 'admin'),
         new lang_string('pathtopythondesc', 'admin'), ''));
+		$temp->add(new admin_setting_completed('testsetting'));
+		$temp->add(new admin_setting_readonlymulticheckbox('testsetting2'));
+		$temp->add(new admin_setting_readonlymultiselect('testsetting3'));
     $ADMIN->add('server', $temp);
 
     // Support contact.
Index: lib/adminlib.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/lib/adminlib.php b/lib/adminlib.php
--- a/lib/adminlib.php	(revision HEAD)
+++ b/lib/adminlib.php	(revision Staged)
@@ -11819,3 +11819,62 @@
     }
 }
 
+class admin_setting_completed extends \admin_setting_configcheckbox {
+	/**
+	 * Constructor for the setting.
+	 *
+	 * @param $name unique ascii name, either 'mysetting' for settings that in config, or 'myplugin/mysetting' for ones in config_plugins.
+	 */
+	public function __construct($name) {
+		$visiblename = 'Completed';
+		$description = 'This setting should not change if code else where has set it to "1"';
+		parent::__construct($name, $visiblename, $description, null);
+	}
+
+	/**
+	 * This setting is not configurable via the UI.
+	 */
+	public function is_readonly(): bool {
+		return true;
+	}
+}
+
+class admin_setting_readonlymulticheckbox extends \admin_setting_configmulticheckbox {
+	/**
+	 * Constructor for the setting.
+	 *
+	 * @param $name unique ascii name, either 'mysetting' for settings that in config, or 'myplugin/mysetting' for ones in config_plugins.
+	 */
+	public function __construct($name) {
+		$visiblename = 'Readonly Multi-checkbox';
+		$description = '';
+		parent::__construct($name, $visiblename, $description, null, ['1' => 'One', '2' => 'Two']);
+	}
+
+	/**
+	 * This setting is not configurable via the UI.
+	 */
+	public function is_readonly(): bool {
+		return true;
+	}
+}
+
+class admin_setting_readonlymultiselect extends \admin_setting_configmultiselect {
+	/**
+	 * Constructor for the setting.
+	 *
+	 * @param $name unique ascii name, either 'mysetting' for settings that in config, or 'myplugin/mysetting' for ones in config_plugins.
+	 */
+	public function __construct($name) {
+		$visiblename = 'Readonly Multi-select';
+		$description = '';
+		parent::__construct($name, $visiblename, $description, null, ['1' => 'One', 'A' => ['2' => 'Two'], 'B' => ['3' => 'Three', '4' => 'Four']]);
+	}
+
+	/**
+	 * This setting is not configurable via the UI.
+	 */
+	public function is_readonly(): bool {
+		return true;
+	}
+}
Index: mdl-82214.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/mdl-82214.php b/mdl-82214.php
new file mode 100644
--- /dev/null	(revision Staged)
+++ b/mdl-82214.php	(revision Staged)
@@ -0,0 +1,9 @@
+<?php
+
+define('CLI_SCRIPT', true);
+
+require(__DIR__ . '/config.php');
+
+set_config('testsetting', '1');
+set_config('testsetting2', '1');
+set_config('testsetting3', '1,3');