Alternative method for full screen wallpapers
I really hate Android's default zoom and crop for wallpapers, and for my purposes this method works better than the picSpeed
You need the following apps:
MultiPicture Live Wallpaper
(I don't know if the regular ADW.Launcher supports the no scrolling option)
To make a wallpaper stretch full screen I used MultiPicture Live Wallpaper and set up the wallpaper to "fit to full screen". Make sure the picture is set to the home or center window, in my case I set it to screen 3, since I have 5 screens.
This has to be used with ADWLauncher EX, because MultiPicture Live Wallpaper won't display correctly on the stock launcher.
Then in ADW settings -> general behavior -> animations and effects -> wallpaper scrolling set if off if you only want this wallpaper to show.
Now you left with a single full screen wallpaper that is not zoomed in and not cropped.
If you leave the scrolling option in ADW on then each screen will contain a fully fitting non-zoomed wallpaper.
See Xperia Play Games on my YouTube channel