Since I am all jolly and full of holiday spirit at the moment, I'll add something that occurred to me as this thread and the wine were mulling...
I do think that being able to adjust the neck angle on a guitar is a reasonable design goal, and I can see how some people would like that capability. But if so, ask for that rather than asking for a truss rod in the neck. That's not the primary reason truss rods are used in wooden neck guitars, and they simply won't work the same way on a carbon fiber neck. CF doesn't have the flexibility that is needed for a truss rod to work. It's too stiff.
There have been a number of patents on designs to do this, but they haven't been widely adopted for the obvious reasons... they add expense and complexity to the instrument, and most players just don't care that much.
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