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This helps tremendously.

I think that marshal is probably overkill. Rather, you need
helper routines to convert longs to and from binary. You can
do everything else using the struct module, and it's
probably easier to write your own protocol using that and
these helpers. I suggest that the best place to add these
helpers is the binascii module, which already has a bunch of
similar things (e.g. hexlify and crc32).

Note the xmlrpc is bundled with Python 2.2.

Looking forward to your patch (much simpler to get accepted
than a PEP :-).