I think class django.contrib.syndication.feeds.Feed need item_categories methods that allow use of categories also in high-level syndication framework. Something like this should work:
# ITEM CATEGORIES --One of the following three is optional. The # framework looks for them in this order. # # If you specify this, you must specify item_categories. def item_categories(self, obj): """ Takes an item, as returned by items(), and returns the item's categories as a Python list. """ def item_categories(self): """ Returns the categories for every item in the feed. """ item_categories = ("Action", "Drama", "Sci-Fi",) # Hard-coded categories. Cherrs, Flavio Curella.