I also am setting up some multilingual websites (English and Chinese) and want to disable the multilingual url aliases so there is only one URL alias in English for both my languages.
Well, I don't know about disabling multilingual URL aliases, although that seems the simplest solution. The way we solved it was to add an extension providing a URL alias filter which is working well on eZ Publish 4.2 and should work on other versions too. See the thread at http://share.ez.no/forums/developer/multilingual-japanese-url-alias
