Yes, editing file information in batches is easy and fast.
Browse to your archive and select multiple files. The file information (file info) fields are displayed on the right of the screen.
You can write new file information to multiple files, edit existing data (where the data is identical for all files) or 'add' file information to files that already have information. You can even selectively remove keywords from batches of files too.
Click here to see a video tutorial explaining how to edit file information.