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Macro:

I don't know whether you need the macro or not (you probably
do for the type checks). In any case, you can do without
relying on Python providing you this information via the build
process, since only datetimemodule.c is using the header
file while Python is being built.

TimeFromTicks(): 

I' ve stated my point. I don't think there's anything
to add - I'm tired of fighting for these things... one of
the reasons I stopped actively discussing things on 
python-dev. 

IMHO, a product that's aimed at developers
should make things easy for the developer and try to
avoid code duplication if possible. The API is needed
in order to support database interfaces that use Unix
ticks as basis for date/time, so if you don't add it to
the module, the ten or twenty module authors out
there will have to duplicate that piece of work in their
implementation.

Transition:

This was already discussed on the db-api list. We love
freedom of choice. Nothing to add.