It may be possible to do this but it does require some understanding of computer programming. Have a look at this post:
https://social.microsoft.com/Forums/en-US/34be9f59-8bf2-4250-9572-ba6df46062fc/hacking-ms-money-dialogs-to-be-more-usable?forum=money
Note that youngpr asked the same question that you are asking but there was no response. I suspect that no one has taken the time to figure out how to edit this particular dropdown.
Bill Becker