Add a (more...) link when you specify a manual except to a post using the "Excerpt" post meta box.

my_memberlite_manual_excerpt_more.php

<?php
/**
 * Add an excerpt more string to manually created excerpts.
 */
function my_memberlite_manual_excerpt_more( $excerpt ) {
	$excerpt_more = '';
	if ( has_excerpt() ) {
    	$excerpt_more = ' <a href="' . get_permalink( ) . '" rel="nofollow">(more...)</a></a>';
	}
	return $excerpt . $excerpt_more;
}
add_filter( 'get_the_excerpt', 'my_memberlite_manual_excerpt_more' );