Hi!
Yes, with a modification to one of the plugin files this is possible.
Open up the wp-content\plugins\ajax-search-pro\backend\metaboxes\default.php and scroll to line 46, which should be this:
[php]if ( in_array( $post_type, $post_types )) {[/php]
..and change that to:
[php]if ( in_array( $post_type, $post_types ) || 1 ) {[/php]
That should hopefully do the trick 🙂