Slider Order

No, now it is impossible. If You want change order of post segregation You have to do some changes in code.
Plugin use “get_posts” function (http://codex.wordpress.org/Template_Tags/get_posts)

$args=array('post_type' => 'ml_post_slider', 'post_status' => 'publish', 'ml_post_slider_categories' => $instance['ml_category'], 'order' => 'ASC', 'numberposts'     => 100);
$posts_array = get_posts( $args );

If You want change something please try in 181 line with ‘orderby’ parameter.

In near future plans to release ML Post Slider ver 2.0. It will be much better than 1.3 version;)