Where did the term "timing" or "timed" screws ever come from? I never heard it until about 2-3 years ago, and it seemed to surface only on this site. I think it's a term somebody made up; I was always taught the proper terminology was "qualify", referring to the finishing (of assembly) practice of making sure all screw slots are parallel along a chosen axis (e.g., horizontal or vertical) in a receiver face or similar surface in which one or more screws are oriented to each other to ensure proper slot alignment. In the case of a gun with only one floorplate screw, for example the A.H. Fox, the screw is "qualified" along a butt-to-muzzle axis so that the slot follows this line.
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Threaded Mode