"Reinhard Kotucha" <[log in to unmask]>, 30.12.2010 02:39:15:
> Please note that I regard LaTeX more as a markup language rather than
> a programming language.  LaTeX has a clear syntax, optional arguments
> are in box brackets, not in curly braces.  I don't see any good reason
> to break LaTeX's syntax rules deliberately.

We have presented examples before where present LaTeX syntax 
is not nice, and this still is my opinion.

A better proposal than using different category codes is 
programming macros with optional arguments obeying 
a convention that makes a choice of delimiters available to users.  
Any macro package replacing \@ifnextchar[ by some 
\ifx\let@token\opt@arg@delim could be run this way. 

If no LaTeXY will adopt this, I will call it L├╝TeX :-)

Cheers, 

    Uwe.