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It is an abuse since I didn't design that part of the API to function that way, but it's cool that it just happens to. =)
I do see your use-case and it is legitimate, although extremely rare and narrow. Let me think about whether I want to add specific support either through your approach, Richard, or if I want to decouple the setting of module attributes so that it is more along the lines of::
 main_module = imp.new_module('__mp_main__')
 loader.set_attributes(main_module) # BRAND-NEW; maybe private to the stdlib?
 main_module.__name__ = '__mp_main__'
 code_object = loader.get_code(main_name)
 sys.modules['__main__'] = sys.modules['__mp_main__'] = main_module # OLD
 exec(code_object, main_module.__dict__)
I'm currently leaning towards the latter option since it's an annoying bit to get right and it doesn't hurt anything to expose.