How to use special chars in alias?

I’m setting up a multilingual website with the Friendly URLS module set to on.

Now, I want to use mutlibyte characters in the alias field of the pages (ex: ヘルプ). But all non alphanumeric characters are removed.
So I’ve tried with their urlencode() version, but the page can’t be accessed (ex: %E3%83%98%E3%83%AB%E3%83%97).

ex:
I want to display
mysite.net/ヘルプ.html (but I can’t insert such characters in the alias)
I tried with
mysite.net/%E3%83%98%E3%83%AB%E3%83%97.html (but ModX says me this page doesn’t exist)

Is it possible to add urlencode multibyte characters or accents in the alias?

we (Persian users) use the URLs same what you said like mysite.com/صفحه-اصلی.html
and using mysite.com/صفحه-اصلی.html directly works well and it does not need to use mysite.net/%E3%83%98%E3%83%AB%E3%83%97.html.

maybe mysite.net/ヘルプ.html works!

http://modxcms.com/forums/index.php?topic=27058.0