Multipe excerpts, length & read more

Did you ever figure this out? I use this function that removes the more tag essentially and then I call a more tag manually for each area of the site I want different more tags.

function new_excerpt_more($more)
{
    global $post;
	return '<a class="moretag" href="'. get_permalink($post->ID) . '"> </a>';
}
add_filter('excerpt_more', 'new_excerpt_more');

My excerpt call looks like this. You can easily customize what the more tag looks like both with HTML and then CSS of course.

echo apply_filters('the_excerpt',get_the_excerpt().'<a href="'.get_permalink().'"> more ?</a>');