This works great in v4.1.10 - you know what would put this mod over the top!?!
"1. the default "No Image Available" image is displayed if none is assigned"
If the first available image in the subcategory group was displayed instead of the no_image_available default image.
...OR!!! To randomly grab a new image from the subcategory group. So if you have 115 products in a subcategory and 108 of them have an image associated with it (i.e. not a no image available image). The subcategory image would show any one of the available 108 available images each time the page reloads. And in my beautiful perfect world, the image would auto resize to a predefined subcategory image size.
I'm liking this mod more and more.