Potential new weight type?

Hello everyone! I have a quick one for you all! So at somepoint in the next chapter I need to crack open the walls of code that is the weight gain system to add new stages, fix some misc errors etc. However a lot of people have requested a weight type where fat only goes to breasts and ass and NOWHERE else. It's doable and a since I'm there thing. I just kind of wanted to gage if you guys would also be interested in this?