Limit the number of pages created by the paging

This seem to work. Put in your functions.php:

add_filter('pre_get_posts', 'limit_pages');
function limit_pages($query) {

    $query->max_num_pages = 5;
    if ($query->query_vars['paged'] > 5) {
        $query->query_vars['paged'] = 5;
        $query->query['paged'] = 5;
    }

    return $query;
}

But I guess you would still need some workaround for posts pagination and authors. Hope it helps you a little.