[Plugin: WP Nivo Slider] Order the posts/slides and add options

The Nivo slider is great, I use it all the time because it has a lot of different settings. It would be great if could edit the rest of the settings in the admin. As of now I’m editing the plugin file which works and everything but what happens when you update the plugin?

http://wordpress.org/extend/plugins/wp-nivo-slider/