I know there are loads of possible columns for the Files View. Unfortunately the one column which would be really useful to me is not there (yet): one where I can jot down my own notes regarding a specific file.
A specialised version of this idea would be a "nickname" column where one could assign a new name to a file, eg. for packages with loads of files where the creator of the package forgot to name/number the files in a way so one could refer to them easily.