[Plugin: Posts 2 Posts] Limit connection type by template via from_query_vars

First of all, this plugin rocks!

Second, is it possible to restrict a connection type via “from_query_vars” wherein the “meta_key” is “_wp_page_template”?

For example, is something like the following possible:

p2p_register_connection_type( array(
		'id' => 'landing2page',
		'from' => 'page',
		'from_query_vars' => array(
			'meta_key' => '_wp_page_template',
			'meta_value' => 'template-landing-list.php'
		),
		'to' => 'page',
		'title' => 'Show Which Pages?'
	) );

In the above example, I’m trying to get the connection box to only appear on the admin screen for pages which have been assigned a specific template?

http://wordpress.org/extend/plugins/posts-to-posts/