Well, I finally tried and it's tricky for the images.
The 4 different postbit_attachment.... templates all handle the tr/td's differently.
I didn't edit the 'postbit_attachmentthumbnail' template for you guys yet because I don't like the button being displayed 'next to' the image .... looks really stupid that way.
And just adding a carriage return won't cut it, because some folks use inline images.
Let me see if I can create a "vertical" button for next to images.