I recently snuck in a new template routine called "ad_return_exception_template" which allows for templated error messages and terminates processing to boot.
At the moment the only error template in acs-subsite/www/shared is "db-error.adp", designed to return a templated version of the "we had a database error" style error message.
Janine Sisk has written a couple of other simple templates for returning the "complaint" style errors. She'll get this in the development branch soon.
I was going to wait until she was finished and committed the work before telling folks about this.
