You should definately complain and (if you are paranoid) consider preemptive action such as a lawyer if a document with your address went out with the title "Image of Pistol on Screen." You could soon find yourself in posession of a large fine or criminal arrest warrant for attempting to smuggle a "pistol" through an airport. That might have been worth missing your flight.

I understand (and to some degree support) the requirment that something that looks like a gun/bomb be examined by a LEO, but I feel it should be done quickly, efficiently, and without taking your ID away (which is a universal sign of detention) or bags out of your sight. I also wonder if they could do something like show you the x-ray image and say "sir/mam do you know what this image might be?" and then go about doing a normal search of the bag when you laugh and show them the outline of luggage tags. But I'm sure TSA sees a lot of weird crap, and if it's safer for LEOs to check it, fine by me as long as it's done in a reasonable and respectful manner.

From what I read, my big complaints would be 1) bags out of sight, 2) demanding home address without providing a valid explanation under requirements of privacy act (DFW is notorious for this problem though) 3) filing a report with a misleading/accusatory title, 4) refusing to give you a copy of the report. The FSD of DFW should be able to resolve (3) and (4) for you, and if he doesn't you should contact either or both of a lawyer and your congressman.