SQL to add column with default value - Access 2003

Tools -> Options -> Tables/Queries -> (At the bottom right:) Sql Server Compatible Syntax - turn option on for this database.

then you can execute your query:

ALTER TABLE documents ADD COLUMN membersOnly NUMBER DEFAULT 0

With ADO, you can execute a DDL statement to create a field and set its default value.

CurrentProject.Connection.Execute _
   "ALTER TABLE discardme ADD COLUMN membersOnly SHORT DEFAULT 0"