The Django 1.4 documentation on tests states:
For a given Django application, the test runner looks for doctests in two places: The
For a given Django application, the test runner looks for doctests in two places:
The
You could try to write your own testrunner and see, if you can include other files to be checked for doc tests.
testrunner
http://docs.djangoproject.com/en/dev/topics/testing/#defining-a-test-runner