Hello,
I'd love to have a "split screen magnification" feature: in preview, display the same image twice. One for the full frame (no magnification), one for a magnified selection (center, "last used"), zoom selected by slider.
This way, I could judge two aspects of an image at once: Is the image interesting based on its content, and is it sharp. Currently, I first have to select the image for its content, and then zoom in to check sharpness.
Regards