It's be nice if it could collapseable like the TOC, and be collapsed by default. It'd also be nice to gather some stats on the camera models used, if some are more likely to produce featured pictures, etc.
It would be nice if the look didn't suck in general.
When Magnus initially added the support he made the table appear before the image and aligned it to the right, this had the negative side-effect of having a huge table before the image (as opposed to floating beside the image) when the image was too big to fit the table beside it, so I moved it. It would be nice if we could have the middle ground of beside the image if it fits and below it (not above) if it doesn't.
Regarding statistics that wouldn't be practically possible (fast) unless we added a new table named image_metadata and had a seperate field for each valid EXIF tag (of which there are alot), then we could add an advanced Image search.