marc Good question. Being a photo-eccentric file browser, it would definitely be a useful feature to be able to search images by iptc/exif. The only challenge is that this would definitely require pre-indexing all image data into a database (or JSON file) up front. While simply searching the file system is relatively fast, having to open all image files to search meta data, would be extremely slow. Normally a feature that is exclusive to larger database-apps that control and manage all files that are uploaded.
Definitely something to consider, but it's almost like two separate (related) projects. Thanks for posting!