Yes, that's what's keeping you. The thinking behind adding that code was that if the custom post types aren't shown on the frontend, we might as well not bother with them, as the users won't be able to see them (because they are not shown on the frontend).
On the other hand, that can be changed, and I can implement a checkbox to show non-public post types as well. If you need to use this as soon as possible, change this
$all_posttypes = get_post_types( $pt_args, 'names' );
$all_posttypes = get_post_types( '', 'names' );
it will work. I need some time to update the plugin, so if you want to use it asap, this will do it, otherwise you can wait for 1.6.7, which might take a week due to other things I need to do.