Normally, you want "Best Fit and Maintain Aspect Ration (No Clipping), This is great for images larger than your screen but this setting will enlarge a small picture to fill the screen, and it looks quite bad.
Choosing "Center" works for smaller images, but larger ones get cut off...
So, if you have a mix of large and small images, there's currently no single selection that works.
I would suggest: "Best Fit and Maintain Aspect Ration (No resizing if less than Screen Resolution)
This is an interesting idea, but I have "locked" the feature set for the v3.0 release already. The only reason I am going to touch the code now is if a show-stopping bug appears in Beta 20 (being released this weekend). However, I have added this to my "investigate for v3.1" list, so I'll give it some more thought for the next release. Thanks!
Thanks for the consideration. It would save a lot of us from having to manually resize all our wallpapers that are largerthan our resolution, so we can also use ones that are smaller than our resolution.
It's true, I often find that different wallpapers require different sizing modes. This becomes more apparent when you are using the random image changer, as you never know what resolution wallpaper you're going to get.