[support] Alter user page menu local task

[luca capra]

Hi all,
I would alter the order and default local task on user page.
I'm trying using hook_menu_alter, with no luck (cache is flushed on each 
request)

/**
  * Implementation of hook_menu_alter().
  */
function mymodule_menu_alter(&$items) {

   // dashboard is default
   $items['user/%/dashboard']['weight'] = -10;
   $items['user/%/dashboard']['type'] = MENU_DEFAULT_LOCAL_TASK;

   $items['user/%']['type'] = MENU_LOCAL_TASK;
}

Is the right way to do it ?

thanks in advance,
Luca