I don't get the point of this mod. Why not just use the attachment mod's thumbnail feature? It does the same thing. Besides...shrinking the image does not shrink the size of the image file...so...even though the dimensions are small...the full size is loaded.
For all of you who all this does it make it so the pictures are clickable, you must go to the "Special Categories" section of "Extensions". If you scroll to the bottom you can input a maximum width and height.