Although this module is supposed to just make resized images nice and crisp when resized, IMO a feature that is just as important is the fact that remote images are copied to your server to make them local. This solves the problems associated with hotlinking to images. Eg. On our school website with children linking to images around the Net, I'm going to have to be very aware of other webmasters deciding to serve us porn or sick images instead of the hotlinked images - this is easily done in htaccess.
However, at the moment the copying is done transparently - if the user doesn't resize the image, a local copy isn't created on the server. They're making a decision about the image without even knowing it. So I was wondering if it was possible by adding an option to 'always make a copy of remote images', so it wouldn't be necessary to resize them first? This would still be a transparent action to the user, but puts the decision back into the website owner's hands.