I was interested in adding the location (one that I enter since I do not have GPS for camera). I also wanted to add support mechanism (tripod or handheld). Maybe time of day, time of year. Things like that that go beyond just the date and time. I want to make it appear friendly for viewers. I think I can add these by adding new fields to the media uploader.
However, the bigger issue for me is to be able to edit the actual EXIF data. Not all my photos have it, and I do not have the raw files for all of them to update. I was looking at using wp_get_attachment_metadata to grab the metadata, put it into media uploader fields, and the update the metadata with wp_update_attachment_metadata. That does not seem to work very well.
I suppose this modification attempt is well beyond the plugin. I am sure I came up with something.
Really great plugin. And thanks for the awesome support.