It sounds like you just need to check the box for "Enable Optional eBay Gallery Images" and ignore placing images in the "Auctiva Image Selection" section of the lister page when you are creating your listings. This way you only have images displaying in the header section of your listing and none in the body with the template.
Personally, I like an image or two in the body with the template, it just seems too bare without them. But again, that's just me!
Hope that helps!