Hello SpunkyBob -
you can add your images to listings at full size using the description editor when composing your descriptions. There is a tool in the lower tool bar , the 6th from the right, that will allow you to insert your images directly into the description editor at full size. You will still need to include at least your Header/Gallery image in the image selection area of the lister and any optional eBay Gallery images you wish to include, but you can use this tool to insert your images at full size into your descriptions. Note that you can then left click on the image and select image properties if you do wish to change the image size.