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I would think that if Windows doesn't support a specific signal, os.kill should raise a ValueError. But I'm an outsider here, I know nothing about how Windows works for this except what I'm reading here. 
To answer your question: there are many reasons to call kill on unix, and only a few of them kill the process. Kill is just an historical name, it really means 'send a signal'.
In a broader picture, I think that os.kill calls should have the same "meaning", insofar as possible, on both linux and windows. Having a single API with the same syntax but different semantics on different platforms sounds bad to me.