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Currently, when you create a Process, all arguments you pass to its __init__ get pickled. I understood this is done because arguments to __init__ almost always become attributes to the Process. Like this:
def MyProcess(multiprocessing.Process):
 def __init__(self, whatever):
 self.whatever = whatever
Of course, attributes must be pickled so they can be accessed from the separate process (on Windows). And indeed in most cases all arguments to __init__ become attributes, so this makes sense.
But, in some cases you pass in arguments to __init__ that do not become attributes. In my case, __init__ takes an object, and takes some attributes of this object as attributes to itself. The object is unpicklable, but the attributes are. So I had to make some ugly workaround to make the program run.
So I think it would be better if Process would be smart enough to pickle only the arguments that get set as attributes.