OK, I'll fix this as well soon. I'm just about to release a new big hack today, so it will have to wait until tomorrow at least. =]
It would be an easy fix just to add the image to the postlist page in the same way as it is done on the forum index. But then you would only get the image and nothing else.
What I'm using at my board is an inclusion of a file below the menu on the postlist page when viewing the newest threads. This way I can add both images as well as a long description or good links (forum specific FAQ:s etc). Would this be interesting as well?