At this time the output of Special:UnusedImages has a singular output, and not in an evident organised form
The ability to be able to sort the output of list alphabetically, would be useful. While this could be done for all output, it would be more useful to have this as a generatable option.
An example is for the Wikisources where files extracted from works will often be named according to the work, so would have a formulaic naming pattern. Trying to find images from a work based on an unorganised list is problematic, especially with current image/filename output.