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add_filter( 'addquicktag_post_types', 'my_addquicktag_post_types' );
/**
* Return array $post_types with custom post types
*
* @param   $post_type Array
* @return  $post_type Array
*/
function my_addquicktag_post_types( $post_types ) {
$post_types[] = 'カスタムポストの名前';
$post_types[] = 'カスタムポストの名前';
$post_types[] = 'カスタムポストの名前';

    return $post_types;
}