As far as I can tell, how this mod does the breast expansion morph is the only way to do it in SR3. SR4 has some parameters that do a better job of breast expansion without the side effects of this mod. If this affects certain must-wear clothes for you, you will have to experiment and reduce the numbers until those clothes fit. And now, the files and image examples: level 0-beta. I just quit a SR4 session just now out of total frustration with a main quest task, jumping platforms crap.
Khaleesi. Age: 25.
As far as I can tell, how this mod does the breast expansion morph is the only way to do it in SR3.
Lilah. Age: 30.
Muscle and Fat Body Slider Extension (with Optional Breast Slider Extension)