EasyPose is a brand name for Posers ERC . You can manually add it to any figure, its basically a master dial that can control slaves in the various body parts. Irregular shapes would be a mix of different values in the slave dials and you would get the same irregular shape each time.

EasyPose and AllTiedUp are utilities that make ading the master and slave dials much easier. Worth the expense if you plan on doing much wirh it.

There are also a few python scripts that allow you to select multiple body parts , and apply a bend,twist to all of them. Its a sort of external easypose program.