I found this example of what I wish Poser had.  Yes it is a rather silly program, but the effect is well implemented and runs in real time.  I'd like to be able to freely apply this type of dynamic to existing figures and props, as it would be very tedious to animate this by hand.

http://www.youtube.com/watch?v=Sn1mvKbje0I

I'm not looking to make giant breasts or anything "objectifying", I just want natural looking animations without the unnecessary effort.  If this feature were implemented the way I'd like, my first use of it would more likely be to try and give bounce to the transmapped hair I use. 

I never intended to disparage the program for not yet having this feature.  I just don't agree with those who feel the feature is unnecessary, or too high-end for Poser's price range.  Dynamic cloth and hair were once considered "high end" features, but the developers of Poser wisely realized those were logical features for a character animation program to have, and so now we do.  I feel precisely this way about soft-body/spring dynamics.

I don't see the distinction between stills and animations, except that manually simulating this effect is doable for stills but time prohibitive for animations.  Having a spring object (similar to our magnets and waves) would simply the creation of both, and might possibly look better as well.