[Texmacs-dev] Why not use unicode?

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As a native Chinese, I have to  say that TeXmacs still has some problems with East-Asian characters.
1. I cannot copy text containing Chinese character to TeXmacs. It just gives me many question marks like "???texmacs???".
2.switching between Latin fonts and Chinese fonts is very annoying. When I'm writing Chinese characters, I have to switch to Chinese fonts.Or I will get many red number. I think if TeXmacs can auto-switch to a default Chinese font when i'm writing Chinese character, It will be better.
3.The Chinese characters are stored in the way like <#3333> in the *.tm files. why not just use unicode?

I have used the XeTeX for some time.  It uses unicode in the backend and support East-Asian characters very well. I think if the backend uses unicode, the problems above will be solved easily.