by Itamar Ostricher on WordPress.org
Convert "current" as the current page ID when using the display posts shortcode to query custom fields.
Usage:
When using the display-posts shortcode plugin with the meta_key="custom_field_name" and meta_value="current" to list all posts that have the ID of the current page as the value of the specified custom field, add the meta_is_id="true" to convert “current” to the correct ID.