According to the documentation this should work:
http://ez.no/doc/ez_publish/technical_manual/4_x/features/policy_functions#eztoc86331_2

Some modules do not have functions (for example, this is true for the "search" and "collaboration" modules). In this case, granting access to a module means that the user(s) will get access to all of its views.

Steps to reproduce

$ViewList = array();
$ViewList["register"] = array(
"script" => "register.php",
"params" => array( ),
"default_navigation_part" => 'ezmynavigationpart',
'single_post_actions' => array( 'PublishButton' => 'Publish',
'CancelButton' => 'Cancel',
'CustomActionButton' => 'CustomAction'
) );

$FunctionList['user'] = array( );