Okay, following the example of Pathauto, I used hook_field_extra_fields() to get my module's data to show up on "Manage Fields." Now how do I get it added to "Manage display" so that user can place it wherever they want (it would be extra nice if Display Suite could also see the field)?

Nancy  Injustice anywhere is a threat to justice everywhere. -- Dr. Martin L. King, Jr.