I am developing a website using Django 1.4 and django-registration
I would like to allow users to create their user names using arbitrary Unicode charac
See http://docs.b-list.org/django-registration/0.8/views.html
After creating your own registration form you can pass this form to the register view of django-registration. Look for the registration.backends.default.urls
module
url(r'^register/$', register,
{'backend': 'registration.backends.default.DefaultBackend',
'form_class': MyRegistrationForm},