You may do it by yourself. In the Studio->Developer->Navigation area. Just create the profile stat item's the copy of the "Friends requests" link, but in the "Addon" field put the following code:

array (

  'module' => 'system',

  'method' => 'get_connected_content_num',

  'params' => 

  array (

    0 => 'sys_profiles_friends',

  ),

  'class' => 'TemplServiceConnections',