I found your project RemoveCookie useful but I wanted to add the ability to display cookies without removing them. Since this changes the basic premise of the application to be non-destructive it seemed weird to submit a pull request.
I created a new project called SafariCookies which is based on RemoveCookie but adds support for POSIX-style command line options. The only option supported now is --remove / -r but more could be added in the future.
Hope you don't mind. Let me know what you think.
https://github.com/mluton/SafariCookies