Customizing The_Excerpt

I wasn’t able to locate this on Google, so I was hoping that someone could help me here.

I’m using the following code to customize the_excerpt output.

function improved_trim_excerpt($text) {
        global $post;
        if ( '' == $text ) {
                $text = get_the_content('');
                $text = apply_filters('the_content', $text);
                $text = str_replace('\]\]\>', ']]>', $text);
                $text = preg_replace('@<script[^>]*?>.*?</script>@si', '', $text);
                $text = strip_tags($text, '<p> <em> <i> <b> <strong> <img>');
                $excerpt_length = 50;
                $words = explode(' ', $text, $excerpt_length + 1);
                if (count($words)> $excerpt_length) {
                        array_pop($words);
                        array_push($words, 'read more...');
                        $text = implode(' ', $words);
                }
        }
        return $text;
}
remove_filter('get_the_excerpt', 'wp_trim_excerpt');
remove_action('wp_head', 'rel_canonical');
add_filter('get_the_excerpt', 'improved_trim_excerpt');

Obviously on the page I’m calling the file I just put in the_excerpt()

What I’m wondering, would it be possible to make the_excerpt() a ‘conditional’ kind of tag? A few areas of the site that I’m working on require no “read more” information, where as other sections do. Is there a way to modify the actual call itself?

For example:

<?php the_excerpt('no-read-more');?>