create a custom node tab with a custom path

Is there anyway I can customize the paths to a node's tabs?

When using either pathauto or hook_menu_alter, I can change the path to the node view to from node/node_id to, well pretty much anything, but let's say xyz/node_title.

The node tabs, however, still stay with the path /node/node_id/tab_name

I'm trying to add a custom tab to the node, and keep the custom path as well (e.g.: xyz/node_title/tab_name instead of node/node_id/tab_name)

I manage to add the custom tab via hook_menu:

<?php
  $items['node/%node/members'] = array(
      'title' => 'Manage Membership',
      'page callback' => 'mymodule_members',
      'page arguments' => array(1),
      'access callback'   => 'mymembers_members_access',
      'access arguments' => array(1),
      'type' => MENU_LOCAL_TASK
  ); 
?>

but if I try to customize the path, either at hook_menu or at hook_menu_alter, the tab just disappears.

Any ideas?

Thanks,
Omer.