Separate muscle/fat sliders

Can we be able to use muscles and fat sliders spearetedly on Base Game? Like only arms or torso? I think this would help to create more specific and unique bodies for sims and give us, players, more customization. 

The team could go with an easy way (arms, legs and torso) or a extended way (left/right upper/low arm, chest, abs, backs, etc.)

Some references from TS2 console version where we could change the proportion of specific body parts:

Arms proportion change

Legs proportion change