Yes 
inZOI already has sliders for body weight and muscle definition.
What’s needed now is a height controller 
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Do You know it’s very difficult, right?
For models of each height, developers will be forced to write new algorithms and new animations, both for interacting with inanimate objects and with other Zois. It may take more than 1 year. If the developers will only be engaged in this one task and will not release any other content and updates, if they will not fix bugs
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This can be done when the game reaches its full release. 
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