You can't really control that within the media library. Best option is to create a slider page type (content only) with the necessary fields (name, image url, text, etc.). Then under the home page, place a folder called sliders. Below the /Home/Sliders folder, add new slider pages. Select the image URL from the media library using a URL Selector. In your repeting control (repeater or even MVC) you can order by
NodeLevel, NodeOrder, NodeName which follows how things are ordered in the content tree.
This is the easiest solution and gives you more control