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sorry for the late response to this thread, but i've just discovered the answer to this question myself.
wallpaper size for the thunderbolt is: 960x800
when setting your wallpaper, you'll get the green outlined cropping box. touch the edges of the box and you can stretch it to fill the full picture so you won't get any cropping.
yes, it will stretch the box proportionally, but if you have your original wallpaper sized to 960x800, when you stretch you will encompass the entire image, thus not getting any crop of the image.
The on screen size for the bolt is 480x800. If your pic is that size, itll fit on one screen if you set it to NOT scroll.
that's what I think my problem is...where do you set it to NOT scroll? looked all over for that and couldn't find anything...