ChristiaanJ (CJ)...
I'm not sure we're really answering your question, are we ?
Were you thinking of reccy pods, ECM pods, and suchlike?
I would say they're most designed for low-drag as much as possible.... not to add a bit of lift - that would change the handling characteristics of the aircraft, something the pilot wouldn't appreciate.....
Yes, I was more referring to a pod used to carry electronics (optics, electronic warfare, etc.) versus an engine. I understand about anything added to the wing today (external fuel tank, weapons, etc.) adds a significant amount of drag and today's designs try to minimize the drag as much as possible. Has there been any studies that examine a pod that has more of an airfoil type of design? Would it help.
BTW...thanks to all responding to the question. The more I'm reading the more questions I have...