In addition to what James and Luke have to say, you might want to look at this thread on the developers list:
http://groups.google.com/group/django-developers/browse_frm/thread/53ce5282c9e29df8/ You should mostly ignore my incoherent ramblings there, but Robert Wittams identified an elegant solution to my problem which I think is the same one you have. Hope that helps.
