Index: views.module
===================================================================
--- views.module	(revision 687)
+++ views.module	(working copy)
@@ -183,7 +183,7 @@ function views_menu_alter(&$callbacks) {
   $views = views_get_applicable_views('uses hook menu');
   foreach ($views as $data) {
     list($view, $display_id) = $data;
-    $result = $view->execute_hook_menu($display_id);
+    $result = $view->execute_hook_menu($display_id, $callbacks);
     if (is_array($result)) {
       // The menu system doesn't support having two otherwise
       // identical paths with different placeholders.  So we
Index: plugins/views_plugin_display_page.inc
===================================================================
--- plugins/views_plugin_display_page.inc	(revision 687)
+++ plugins/views_plugin_display_page.inc	(working copy)
@@ -46,8 +46,11 @@ class views_plugin_display_page extends 
 
   /**
    * Add this display's path information to Drupal's menu system.
+   *
+   * @param $callbacks
+   *   A menu callback array passed from hook_menu_alter().
    */
-  function execute_hook_menu() {
+  function execute_hook_menu($callbacks) {
     $items = array();
     // Replace % with the link to our standard views argument loader
     // views_arg_load -- which lives in views.module
@@ -83,8 +86,27 @@ class views_plugin_display_page extends 
       if (empty($menu)) {
         $menu = array('type' => 'none');
       }
+      // When overriding existing menu items, apply inheritance rules to any
+      // child items.
+      if ($menu['type'] == 'existing') {
+        // Grep all callbacks for router items below the target path.
+        $children = preg_grep('@' . preg_quote($path, '@') . '/.+@', array_keys($callbacks));
+        foreach ($children as $child_path) {
+          // Only inherit properties from parent, if the child is not a default
+          // local task.
+          if (!isset($callbacks[$child_path]['type']) || $callbacks[$child_path]['type'] != MENU_DEFAULT_LOCAL_TASK) {
+            // Add child to our stack of items to replace.
+            $items[$child_path] = $callbacks[$child_path];
+            // Ensure that the parent path really exists and inherit its
+            // properties to the child (not replacing existing properties).
+            if (isset($callbacks[$path])) {
+              $items[$child_path] += $callbacks[$path];
+            }
+          }
+        }
+      }
       // Set the title and description if we have one.
-      if ($menu['type'] != 'none') {
+      elseif ($menu['type'] != 'none') {
         $items[$path]['title'] = $menu['title'];
         $items[$path]['description'] = $menu['description'];
       }
@@ -98,14 +120,24 @@ class views_plugin_display_page extends 
         default:
           $items[$path]['type'] = MENU_CALLBACK;
           break;
+
+        case 'existing':
+          // If the path really exists, copy over its remaining properties.
+          if (isset($callbacks[$path])) {
+            $items[$path] += $callbacks[$path];
+          }
+          break;
+
         case 'normal':
           $items[$path]['type'] = MENU_NORMAL_ITEM;
           // Insert item into the proper menu
           $items[$path]['menu_name'] = $menu['name'];
           break;
+
         case 'tab':
           $items[$path]['type'] = MENU_LOCAL_TASK;
           break;
+
         case 'default tab':
           $items[$path]['type'] = MENU_DEFAULT_LOCAL_TASK;
           break;
@@ -218,9 +250,15 @@ class views_plugin_display_page extends 
       default:
         $menu_str = t('No menu');
         break;
+
+      case 'existing':
+        $menu_str = t('Existing menu');
+        break;
+
       case 'normal':
         $menu_str = t('Normal: @title', array('@title' => $menu['title']));
         break;
+
       case 'tab':
       case 'default tab':
         $menu_str = t('Tab: @title', array('@title' => $menu['title']));
@@ -282,6 +320,7 @@ class views_plugin_display_page extends 
           '#type' => 'radios',
           '#options' => array(
             'none' => t('No menu entry'),
+            'existing' => t('Existing menu entry'),
             'normal' => t('Normal menu entry'),
             'tab' => t('Menu tab'),
             'default tab' => t('Default menu tab')
@@ -434,7 +473,7 @@ class views_plugin_display_page extends 
           }
         }
 
-        if ($form_state['values']['menu']['type'] != 'none' && empty($form_state['values']['menu']['title'])) {
+        if ($form_state['values']['menu']['type'] != 'none' && $form_state['values']['menu']['type'] != 'existing' && empty($form_state['values']['menu']['title'])) {
           form_error($form['menu']['title'], t('Title is required for this menu type.'));
         }
         break;
@@ -465,7 +504,7 @@ class views_plugin_display_page extends 
     $errors = parent::validate();
 
     $menu = $this->get_option('menu');
-    if (!empty($menu['type']) && $menu['type'] != 'none' && empty($menu['title'])) {
+    if (!empty($menu['type']) && $menu['type'] != 'none' && $menu['type'] != 'existing' && empty($menu['title'])) {
       $errors[] = t('Display @display is set to use a menu but the menu title is not set.', array('@display' => $this->display->display_title));
     }
 
Index: includes/view.inc
===================================================================
--- includes/view.inc	(revision 687)
+++ includes/view.inc	(working copy)
@@ -965,10 +965,14 @@ class view extends views_db_object {
   }
 
   /**
-   * Called to get hook_menu information from the view and the
-   * named display handler.
+   * Called to get hook_menu() information from the view and the named display handler.
+   *
+   * @param $display_id
+   *   A display id.
+   * @param $callbacks
+   *   A menu callback array passed from views_menu_alter().
    */
-  function execute_hook_menu($display_id = NULL) {
+  function execute_hook_menu($display_id = NULL, $callbacks = array()) {
     // Prepare the view with the information we have.
 
     // This was probably already called, but it's good to be safe.
@@ -978,7 +982,7 @@ class view extends views_db_object {
 
     // Execute the view
     if (isset($this->display_handler)) {
-      return $this->display_handler->execute_hook_menu();
+      return $this->display_handler->execute_hook_menu($callbacks);
     }
   }