Can the softcover books have full custom covers?

You can upload both a front cover and a back cover, but you can also do a full wrap. You can upload the covers after you create your book using the "generate photo book" option. The generating cover page is pretty cool because you can pick your type, color, and where you want the viovio logo to go in back. You get a very realistic view of what your book will look like.
If you want to go the full wrap cover way, I'd look at this page:
http://www.viovio.com/wiki/index.php?structure_id=448
Part of what it says is:Getting all wrapped up
The full wrap cover is another great feature of Viovio that many individuals use to make breathtaking books. This option is easily selected under the "Advanced" tab during Step 2. of the Product Maker. This option will auto-stretch the front cover image to exactly fit the entire book.
This was a question asked:
I want to upload pdf file for 8.5x8.5 hard cover book with 24 pages (including covers).
Sizes I created: inside pages 9x9.25 (to overlap images on spread.)
What is size for full wrap cover should be? Should I crop full wrap for 2 files (front & back cover). What size?
This was the answer:
Re: full wrap cover
Our Pro and Quick Casewrap's have slightly different size spines. If you upload a full wrap cover, it will be automatically adujusted for the slight variation in spine width. As a ballpark, the Pro would be a 3/8" spine, and the Quick would be 1/2", however the wrap takes a bit as well.
We do not suggest you try to exactly place text or graphics on the spine. You can use the cover designer options to add text.

• Personally I'd experiment with the advanced tab and upload photos until you get one that seems like it fits. Judy

Meaning front and back? Or would it just be the front? If so, do I create a separate back cover and the spine will be white?