No can do with a value list.
You may want to try setting up a selection portal inside a popover for this purpose. using two fields in a portal will give you the columns of data that you want.
For examples of selection portals and other ways to enhance your basic value selection methods, see: "Adventures in FileMaking #2 - Enhanced Value Selection".
Thanks, PhilModJunk, for the quick response and suggested solution. I'll review the selection portal instructions and give it a try in the next few days.
It took me quite a while to get back to this project, but thanks, Phil, for the tremendously valuable examples in your Adventures 2. I'm still learning the FileMaker ropes, and very much appreciate your help.