Hello Joshua -
I think you emailed that you figured this out, but I am going ahead and answering it to help build our knowledge base here in the forum.
The scrollers calculate their width or height based on the width/height of the images and the title height (title, description, add-to-cart) plus padding. So if you look at the Corshops site, you will see that I have a Category scroller and a Product scroller that run the width of the page. I did that by setting a large number of products to show in the window between scrolls, and by setting the correct values of pic width (larger than normal). The inputs cause the scroller to calculate the correct width to go all the way across the page.
This is a good method, as it makes the scroller adjust to the width/height you need based on your settings, rather than you setting height/width and the scroller mashing everything into place.