Hi,

better later than never, autoPACK plugin for softimage 2013 AND softimage 2013 SP1 have been released. It is in an early version, but operational for loading recipe, and it comes with ePMV to load molecules.
Visit http://www.autopack.org/install/softimage-installation for more detail on how to install.
You can visit the autoPACK forum (http://www.autopack.org/support/forum) to search for answers or ask questions.

L