I thought it's to set the default on your images. I'm sure I've used it to set at least part of mine and how I want them to appear. I know the 100 images isn't to do with the listings necessarily and is how I prefer to view mine, even though it takes longer to load the page.
There is Name Ascending/Descending and Date Created Ascending/Descending. Did you try it out and see what the results are?
After Thought (& probably not related): When listing, if you want to change the order once images are chosen, select the 'list' option from the dropdown.
I must just not be understanding your question. Maybe someone else will be along that can better help.