[XeTeX] Greek (and other Unicode) letters in math mode

[Gerrit]

Hello,

I always wonder why I can, if I write a formula in math mode, write 
latin letters (b, g etc.) as they are but have to write out greek 
letters like \alpha or \rho.

Wouldn’t it be nice if I could write:

$$ a^3 \cdot ψ \cdot Ω = ∞ $$ ?

Or maybe even further:

$$ a³ ∙ ψ ∙ Ω = ∞ $$

Well, this would maybe not really be an advantage in typing (I think, 
for most people it is easier to write \Omega rather than copy and 
pasting Ω,) but rather that the Tex Editor (if you use one) would 
automatically convert \Omega to Ω, so that the Tex code is easier to 
read. Of course, some stuff you cannot make easier (\frac etc), but for 
other symbols and characters, it would be nice if one could just /read 
/them in the code.

I think, Xetex would then just need a mapping table converting Ω to 
\Omega before compiling.

What do you think about that?

Gerrit
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