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FWIW, I didn't disagree on filter(). Am taking your suggestion under
advisement for a couple days. At this point, I'm leaning towards
accepting the request (although with a different version of the patch).
For map(None, ...), I happy to live with examples like the patch you
referenced. It's important that this API be as simple and clean as
possible. It's a matter of taste. I concur with Guido that we never
would have created map(None, ...) if zip() had existed. The primary use
case is obsolete. 
Also, I think the motivation behind your other use case will likey be
addressed in a more general way with an identify function being added to
the operator module. That is a more explicit and less hackish than
having a special meaning for None. It is also more in-line with the way
functional language approach the same problem.
Will meditate on both of these for a couple days and get back.