Comments are closed on that blog, or I would post this there.
In the options page for it, there is a drop-down box that lets you choose from the images in the directory to add to your random images. But the box is shortened, as if there were no options there. There are files in the directory, and you can expand the combo box, and see all the files, only you can only see the first two letters of each of the file names. Here is a screenshot: http://www.packerworld.com/nate_personal/screenshot.jpg