I have read this article with relative topic:
How can I use the Chinese IME with a Dvorak layout?
It works fine on Windows 7 and also Windows 8 desktop.
But keyboard layout become QWERTY in Metro (Windows 8 App).
So, any one could suggest an Chinese(S) IME with Dvorak layout or modify any other IME (such as Google Pinyin, or MS Pinyin) to Dvorak layout?