http://docs.djangoproject.com/en/dev/ref/contrib/admin/#inlinemodeladmin-options
"The InlineModelAdmin class is a subclass of ModelAdmin so it inherits
all the same functionality as well as some of its own:"
(in other words, anything that's legal to do on a plain ModelAdmin is
legal to do on an InlineModelAdmin)
--
"Bureaucrat Conrad, you are technically correct -- the best kind of correct."