Generate filename for image/file field

Hi Knack, it would be cool if an image and file field would have the possibility to auto-name the file, once downloaded.

So lets say, that I have a form where job applicants can sign up.
There would be a Name field and for the applicant, and they would also have to upload an image of themselves.

When I then view the applicants and want to download their image, I would be nice If I could say that the image should be generated with a file name that consists of data from one or more other fields - fx. their Name, Age and applicant number, so that the image would be named Lisa-Jensen-38-17.

2nd that !

A bit more flexibility with images would be great