To be able to show all custom post types on the admin left menu, you have to modify the wck-cptc.php.
Change the position value from this:
$args = array(
'page_title' => 'Wordpress Creation Kit',
'menu_title' => 'WCK',
'capability' => 'edit_theme_options',
'menu_slug' => 'wck-page',
'page_type' => 'menu_page',
'position' => 30 // Right after comments menu and the other
);
to
$args = array(
'page_title' => 'Wordpress Creation Kit',
'menu_title' => 'WCK',
'capability' => 'edit_theme_options',
'menu_slug' => 'wck-page',
'page_type' => 'menu_page',
'position' => 66 // Right after Plugins menu and the other
);
this would allow your more than 4 custom post types to be displayed.
