What I'm trying to do is change the default folder structure of imported images. For example when you import an image magento defaults the directory structure to the first and second letter of the image to create the directory structure under /media/catalog/product/X/Y/XYimage.jpg
I want to be able to modify the core to allow me to change it to something like: /media/catalog/product/SKU/XYZ/SKUXYZimage.jpg hence the first 3 letters are the top level of the directory and the next 3 letters are the second level of the directory.