=Clever, but not obvious control.
The construction line method directly controls the crest and root flat widths.
The threaded holes have lead-in chamfers, so that's easy enough.
As I said, its an interesting diversion, but not of much use in design by which I mean engineering design, not product illustration images. If it is to look good, a helical spiral datum curve is faster to create and won't fail to regenerate. Maybe use a decal texture?
If it directly drives a manufacturing process, there's not much else to do, but the vast majority of helical threads are manufactured either by dedicated tooling such as taps and dies or roll-forming, or by canned manufacturing cycles that do not depend on a surface model. Solid modeled threads are costly to open, copy, regen, and display. Maybe it's not so noticeable for little assemblies, but build an assembly of a few hundred .5 inch .190-32 screws and see if there isn't a bit of a hit on performance.
Same goes for solid modeling of pierced and expanded metal, grating, woven wire screens, knurling, honeycomb, and other items or features that are not fabricated in detail based on the model. It's easy to add 1% or more to the CAD cost of a project for something that adds no value to the execution of the project.
Again - 13.9% into the 21st century and PTC still doesn't supply tools to determine the detailed performance affects of various modeling techniques in terms of CPU cycles spent, memory allocated, and triangle generation/memory for graphics display.
