This addon will allow you to generate featured listing thumbnails by setting the width. The thumbnails are generated using the main image uploaded then resized to the size you specify. The addon generated thumbnail images using the listings you have Featured Listing set to "yes".

Simply place this tag {addon_featuredsize_show} in your featured template between the {featured_img_block} and {/featured_img_block} replacing the image portion of the template.

The addon ilink in the Admin lets you specify the Width and Quality of your Thumbnails.

And also provides for cleanup allowing you to remove all Featured Listing Thumbnails and start all over.