Populate drop down with multiple fields

Populate drop down with multiple fields

I've been looking around for an answer to this but I can't find anything to help me.

Say a form named 'employees' has a field for First Name and Last Name, and a related form wants to do a lookup for each employee.  It would make sense for each entry in the drop down list to contain First Name, and Last Name (and most likely the unique ID).  So far I can only see how to add one of these fields to the drop down.

This will come up in a lot of the apps I'm likely to develop, particularly if the data is to be used in conjunction with Zoho CRM.  Is this something that can be done in the GUI mode, or should I be looking at a DELUGE script solution?

Any help/advice greatly appreciated.