Custom Sort Code

I am trying to find out where I would place the array of parameters for a custom sort.

Right now I have I short code that displays a list of posts:

$q = new WP_Query ( array('meta_key' => '_count-views_all', 'orderby' => 'meta_value_num' , 'posts_per_page' => '20', 'order' => 'DESC') );

	$list = '<ul class="recent-posts">';

	while ($q->have_posts()) : $q->the_post();

		$list .= '<li>' . get_the_date() . '<a href="' . get_permalink() . '">' . get_the_title() . '</a>' . '<br />' . get_the_excerpt() . '</li>';

	endwhile;

	wp_reset_query();

	return $list . '</ul>';

, but I would prefer to have this formatted like the theme. So, I want to place the it within the theme query instead of its own query like this.

Thanks!