I haven't seen an option for a setting like this; so, I would like to suggest that this option be considered.
I have a large number of pictures in my 'Random backgrounds' folder of Deskscapes 10.02. I would like an option whereby Deskscapes would remember which pictures had been randomly shown and not repeat these pictures until all of the images in the 'Random backgrounds' folder had been shown.
I have had instances where Deskscapes has shown the same images a couple of times in a few hours instead of showing an image that hasn't yet been shown.
Rinse and repeat.
Thanks.