Sort order for images in slideshow

By default, the slideshow displays the images in the order they were added in the imagefield. The user has an option to change the order there, but suppose one wanted to display the last image one added to the field, first in the slideshow (desending sort), would it be possible to include a setting to select the sort order ?

Maybe a radio-button where the default sort is ascending, one can click descending.. and maybe a third option to randomly start at any image in the slideshow. Some people would like that everytime they navigate to a page, a different image is shown to the visitor first.

some code like:
$count = 0;
foreach ($items as $key => $item) {
if (!is_array($item)) {
...($items[$key]);
}

reverse the array for descending sort.. or use the random function to randomize the sort.. before the links are generated so that it does not mess up the numeric pager.