Quote - "A bending figure/prop with only one body part?"

Poser bends are an interaction between two actors (body parts). So I don't see how it would be possible to have a one actor figure or prop that would bend via joint parameters. Of course it is possible bend an actor via morphs or magnets, and ERC could be set up so that bend happened in response to a rotation.  

P.S.

An actor does not need to have geometry associated with it, so invisible "ghost" actors can be used to cause bends in normal actors.