The request to pass the exception to error handlers has been won't-fixed in tickets #20156 / #20803. I'd like to reopen the discussion. While the usefulness for 404 errors are indeed questionable, I think it makes sense to provide some context to most error chains through the exception. Typically a message explaining why the access to an object is refused (403). I don't see why Django should prevent such use cases. The discussion is open :-)
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