Plugin: NextGEN Gallery – Edit Add meta data?

Hi. Hoping Alex sees this and chimes in. I’m looking for a way to add / edit image meta data. Not through an import, and not typical exif data. I would really like the ability to add my own key / value pair to any image. Specifically, I’d like to set a custom url for each image to link to. I could see this being helpful for sending through any information you need for a specific image – just like post custom fields. This also would be helpful for just editing current image meta data – e.g. you wanted to quickly edit the focal length, or keywords..

Thanks!