I raised this issue several months ago...taking out-of-focus shots with my D800E.
I wish a feature was available as an option on the D800/E that did not allow the camera to fire unless the subject was in focus. It is a very sensitive camera, especially with top quality lenses, and would help in taking more in-focus images. At least Nikon should offer us this option.
To solve this issue where there can be subject movement (while camera not on tripod) my camera is set as follows: AF-C a1 = AF-C priority selection a2 = AF-S priority selection a4 = AF activation