FWIW - I had door panel rattles that drove me nuts (driver and passenger side). If I put pressure on either door, the rattle would stop. I tried troubleshooting here and there, but wasn't successful. Ended up having a local car audio place remove the door panels and place soundskin throughout (inner door and outer door card, along with various gaps/holes/etcetera). Seems to have taken care of the rattling, and the resultant decrease in noise beyond just that is material. I consider it worth the hassle/money.
Ford really is a victim of their own success as it relates to this particular rattle. The cabin is so quiet that this small rattle is enough to really get on the nerves.