Probably has been brought up already somewhere along the line, but, I feel that at least with pictures that have a ton of layers, the list seems a bit bulky, including the picture of individual layers, and having a sort of word-wrap for the name.
Is there anything to make it just the name and visibility check-box of the layer, with an added side-to-side scroll-bar if one of the names is too long for the window?
Mind you, this is for pictures with 14+ layers. I have one going currently at 25 layers due to the depth of the linework.