Rigging Related - Volume Preservation vs. Squash and Stretch

In Owned, one thing that bugged me about Jeff's rig was that the volume preservation was getting in the way of squash and stretch.  Squash and stretch are two things - its not "squash when stretched."  As an animator, I need a setting tht lets me change how much "volume preservation" affects what is being stretched.  The two images I am adding are of Rambo, but for the needs of the animation style, it needs to be applied to all characters - maybe 1 for full preservation, 0 for none, maybe -1 to do the opposite and inflate the part.

Wile E Coyote is a good reference for this - when he falls off a cliff, his body parts generally stay the same width when they get pulled off screen.  Some example smears from other cartoons, found on Smears, Multiples, and Other Animation Gimmicks

Rambo

Lamb reference video for Rambo

Animation Style!

https://vimeo.com/84290479

So this is a rigging demo, but take a look at the animation style.  I think its really appealing.