Thank you, tomos, MilesAhead, rgdot, Shades, and Cranio for your naming suggestions. And thank you, 4wd, for yours, which made me literally laugh out loud. That was one for the ages.
1) is it possible to add the option "Fit"? This reduces larger images to screen size - but doesnt enlarge anything.
(The Windows 7 options are Fill / Fit / Stretch / Tile / Center.)-tomos
How does Fit differ from the Scale option already in the app? If I choose an image smaller than my screen resolution, and have Windows apply it using the Fit option, the image is enlarged.
2) would it be possible to change the browse dialogue, to an open file type one. More info here:-tomos
It doesn't appear this is possibly natively in AHK. All the workarounds I found are inelegant hacks, too. In my dev build, I changed it so the folder dialog opens at the last chosen folder, though. Maybe that will help.
3) I'm wondering would it be possible to disable a folder rather than have to delete it. If #2 above is implementable, this would not be of such big interest :-)-tomos
In my dev build, I've changed it so you can now check/uncheck entries in the listview. That is, only checked rows will be evaluated for images. Also, after the image list is compiled, the application does remove duplicate images from its internal list. Here's the latest look:
So, about wallpaper changers...Download (should be at least build #36)
http://skwire.dcmembers.com/apps/swallswitcher/sWallSwitcher.zipPlease go here:
https://www.donationcoder.com/forum/index.php?topic=36876.0 
