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Frank Mittelbach wrote:
>  \DeclareDocumentCommand \chapter { s o s o s m o }
>    {
>          {#1} {#3} {#5} {#6} {#2} {#4} {#7}
>    }
>
> this may look like madness :-) but there is some logic behind it:
>
>  *   means no number
>  []  the text for the toc
>  *   don't put text in toc
>  *   don't put text in runhead
>  []  motto if any

What I would really like to see at the user level is the possibility
of relative sectioning commands.  One requirement should be that one
can mix absolute and relative sectioning in a natural way.  To explain
what I mean by this, suppose that the optional argument of \section
and friends was not not already used for the TOC title.

Now I have a document with structure

\section{AAA}
\section{BBB}
\subsection{CCC}
\section{DDD}

and I decide that BBB with all of its sub- and lower level sections
should
really be a subsection to AAA.  I'd like to be able to write

\section{AAA} \label{aaa}
\section[aaa]{BBB}
\subsection{CCC}
\section{DDD}

which makes BBB relative to AAA, i.e. a subsection, and CCC consequently
a
subsubsection, while DDD remains at the section level.

I guess the functionality should be implementable via an .aux file
mechanism
(I am sure the experts will know if there are any pitfalls), but
anything like this will also further overload the argument structure
of sectioning commands.

The only clean solution that I see is the use of keyval syntax, but it
looks like this will seriously break existing end-user code, and also
bypass all this nice new xparse stuff...

Marcel