I made something similar using a notesdocumentcollection populated with the result of a search in the database, for all document in the collection I can then create an array with the values I need extracted from one or more fields per document and put the array in a multi value field hidden in the form or dialog box.
The formula for your list or combo must be simply the name of the hidden field.
I can create for you a demo .nsf if the above is not clear.
Hope will be helpful.
P.S. I'll work on your "fill array with items".

Hi Leslie,

Another solution would be to create a view in the NAB, hidden, collecting all users who have the title "Judge", and do a lookup on that.
Of course, that implies that :
1) you can modify the design of the NAB
2) you must define the view as to not modify or refresh/replace design
3) you remember the view when you upgrade the Domino server

Other than that, the view shouldn't bother anything.