There are cases when I want to use CREATE OR REPLACE TABLE, but also want the statement to work on pre-10.0 versions with an IF NOT EXISTS clause. But OR REPLACE and IF NOT EXISTS can't be both specified, because an error occurs.
So, I have a feature request. Pre-10.0 versions could treat OR REPLACE like IF NOT EXISTS. I understand that the behaviour would be internally different, but it would be ok in most cases I can think.