I'd be ready to bet the devs are more than aware that people would absolutely love to have as many customization options as possible.
Fairly sure that if we are not getting some of them is not because no one at Larian thought we would like them, but because they were considered too much work for too little payoff.
For instance I've seen plenty of people asking for individual sliders to modify "character heads" but the real questions is if a slider-based customization is technically feasible at all with the system Larian is using. Like... Are these "scanned heads" even deformable in any reliable manner? Can they stretch body proportions at will and still have equipment that behave decently on "larger bodies" (or whatever people will do with the sliders)? Etc, etc.
