"William ZHANG" <[EMAIL PROTECTED]> writes:
> Why not change the option "createuser" to "superuser",

Backwards compatibility with existing dump files.

> or do something to make is easier to understand?

See
http://developer.postgresql.org/docs/postgres/sql-createrole.html

SUPERUSER
NOSUPERUSER

     These clauses determine whether the new role is a "superuser", who can 
override all access restrictions within the
     database. Superuser status is dangerous and should be used only when 
really needed. You must yourself be a
     superuser to create a new superuser. If not specified, NOSUPERUSER is the 
default. 

...

CREATEUSER
NOCREATEUSER

     These clauses are an obsolete, but still accepted, spelling of SUPERUSER 
and NOSUPERUSER. Note that they are
     not equivalent to CREATEROLE as one might naively expect! 

                        regards, tom lane

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