Index: modules/system/system.admin.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.admin.inc,v
retrieving revision 1.232
diff -u -p -r1.232 system.admin.inc
--- modules/system/system.admin.inc	2 Dec 2009 14:56:32 -0000	1.232
+++ modules/system/system.admin.inc	3 Dec 2009 21:21:08 -0000
@@ -289,6 +289,12 @@ function system_themes_page() {
           'query' => $query,
           'attributes' => array('title' => t('Enable !theme theme', array('!theme' => $theme->info['name']))),
         );
+        $theme->operations[] = array(
+          'title' => t('Enable and set default'),
+          'href' => 'admin/appearance/default',
+          'query' => $query,
+          'attributes' => array('title' => t('Enable !theme as default theme', array('!theme' => $theme->info['name']))),
+        );
       }
     }