The topic of what construction details are associated with what period, region, and individual maker is, as far as I know, a book waiting to be written.
Years ago my apprentice, Dave Wagner, actually started gathering material for such a book. He was doing a lot of restoration work and knew a lot of collectors that would let him take guns apart. That sort of access is rare and when Dave left the shop his idea sort of died. I wish someone would take it up again. (Some of the construction details will be included in Wallace Gusler's book but this study needs to span all regions and periods to be truly useful.)
We believed then, and I still do, that a maker who was taught a method and had become very efficient at it would be unlikely to change unless the technology changed. I learned, for example, one way to cut dovetails. I have done them that exact same way for 40 years. It is fast, fool proof, and I can get it done without any real thought. I believe that is the essence of "made in a workman-like manner." Save the creativity and experimentation for where it matters.
Of course all the construction details would be considered along with art, architecture, mounts, etc. in attributing a rifle to a particular location or maker.
So, it appears to me that loops or staples, screws or bolts, etc. would be a clue in tracking who a maker was apprenticed to. I have seen elaborate relief carved rifles with a single wood screw in the tang because that's the way that maker did it and so did his apprentices.
Staples become much more popular when flat keys replace simple wire pens so in that case you might make an argument that a rifle with staples, and keys, is a higher grade than the same rifle with pens. But it is the keys that drive the quality, not the staples.
Gary