Some tweaks

booking.admin.inc

@@ -194,6 +194,13 @@ function booking_admin() {
 	'#default_value' => variable_get('booking_dietary_text_definition', ''),
 	'#description' => 'Text to use if attendee may not specify dietary requirements (as above).',
 	);	
+	$form['misc']['booking_enable_studygroups'] = array (
+	'#type' => 'radios',
+	'#title' => t('Enable study group calculations?'),
+	'#description' => t('Select whether to enable the creation and management of study groups.'),
+	'#options' => array (0 => t('No'), t('Yes')),
+	'#default_value' => variable_get('booking_enable_studygroups', 0),
+	);	
 	$form['misc']['booking_csv_exclude_fields'] = array (
 	'#type' => 'textfield',
 	'#title' => t('Fields to exclude from CSV report'),