Regarding the "Use First Attached Image As Default" option, it seems to work only when the images are bigger than a certain pixel width (in my case I use 600pixels). The main column width is 553px, and all my default 553px wide images won't get displayed as the first-attached-default-image. So what I do is create an intentionally larger image (600pixels) and have it resized automatically by the theme. But by doing that, the images aren't as smooth as a proper 553px wide image.
Any solution so that I can prepare the image in 553px width and still have it appear under the first-attached-default image option?
PS: I can also set an image manually to be the default image, but if the width is 553px, it won't work. My full banner default image is 846pixels and it works.
Here is a sample of the 600px wide file resized by the theme to be default image:
http://www.headfonia.com/2010-rocky-mountain-audiofest/
Here is a sample of an image that I prepared to be a precise 846pixels (848 pixel wide minus 2 pixels for the border)
http://www.headfonia.com/vintage-yamaha-orthos/