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The __init__() function for asynchat.async_chat doesn't allow the caller
to specify a channel map. I thought it would make sense to add an
optional 'map' parameter, for consistency with asyncore.dispatcher. If
the parameter is not specified, asyncore.dispatcher.__init__() will
default to using the global map, which is the current behaviour.

+1.
Another inconsistency are the argument names used in __init__ methods,
one called "sock" and the other called "conn":
asyncore:
def __init__(self, sock=None, map=None):
asynchat:
def __init__ (self, conn=None):

Thanks for pointing that out; I've uploaded a second patch that changes
 async_chat.__init__() to use 'sock' instead of 'conn'.
This change shouldn't affect anything either, since the argument is
simply passed to asyncore.dispatcher.__init__().

Fixed for 2.6 in changelist 64768.
Fixed for 3.0 in changelist 64770.