HOWTO: define my own Double-Pinyin (Shuang Pin) mapping keys
Under NJStar Communicator: Open "Options..." (Alt+9) General Tab, and click "Double Pinyin (Shuangpin) Keyboard Definitions".
Under NJStar Chinese WP: from menu Tools - "Options..." - General Tab, click "Double Pinyin (Shuangpin) Keyboard Definitions".