Here is a wrapper class for actors. Use it like a normal actor.

import sys

if sys.version_info.major > 2:
    basestring = str

SCENE = poser.Scene()


class pActor(object):
    """
    Save access to Actor methods.
    For each method call SCENE.ActorByInternalName(self._iname).method([...]) is used.
    """
    __slots__ = "_iname",

    def __init__(self, ac=None):
        if ac is None:
            ac = SCENE.CurrentActor()
        elif isinstance(ac, basestring):
            try:
                ac = SCENE.Actor(ac)
            except poser.error:
                ac = SCENE.ActorByInternalName(ac)
        elif not isinstance(ac, poser.ActorType):
            raise AttributeError("Need an actor or an actors name to proceed.")
        self._iname = ac.InternalName()

    def __call__(self):
        return SCENE.ActorByInternalName(self._iname)

    def __getattr__(self, item):
        if not item.startswith("_"):
            return getattr(SCENE.ActorByInternalName(self._iname), item)


if __name__ == "__main__":
    actor = pActor()  # get current actor
    actor = pActor("Main Camera")  # get main camera, conventional name
    actor = pActor("MAIN_CAMERA")  # get main camera, internal name
    parm = actor.Parameter("Focal")  # get a Parameter

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