Starting from release 18.104.22.1682 Notes Fields Extractor has two new options; ImageFileNameFormula and AttachmentFileNameFormula. With these options you can specify full Notes @-formulas, and use any field or other content in your documents in the formulas! For example, with the new release you can easily extract all employees images into a single directory, and each image has the EmployeeNumber-field content as the filename. Of course you have some extra run-time variables you can also use in your formulas, such as $(BASEPATH) which is replaced with the current base directory.
Take a look at the updated User’s Guide to get an idea of how this works.