a feature copied out from breastexpansion.
this mod adds a modpage to select what breast firmness is desired (in a 0.02 to 1.0 range of firmness)
0 firmness being elastic breasts, 1 being rock solid breasts.
after typing the desired value in the box, hit enter to set the breast firmness
a button labeled 'function on' will toggle between setting the breast firmness every frame, or just when manually set.
since the breast firmness is reset on costume/arm/breastsize changes, this can happen often; which is why it is on by default.