Hi Horst, 
thanks for this really impressive module. It's a dream (even the watermarking is important for me). 
I have one problem. 
I often have to delete images and replace with newer ones. 
But then i get a large amount of orphaned pim-image-files in my page assets folders. 
A solution was mentioned here: 
http://processwire.com/talk/topic/4437-delete-orphaned-filesimages-from-siteassetsfiles/ 
But isn't there a way to delete the appropriate pim-image-file(s) automatically when deleting the original pw-image-file ? 
Greetings, 
Wolf