Question about ArsClassica codes

Question

I would to know for what is used the code below (Last lines code) in arsclassica.sty. Also I would to know why in arsclassica-settings there are some repetitions of \lstset is not the same thing put all the options in one \lstset? And why, for examples this string: \lstset{moredelim={[is][\ttfamily]{!?}{?!}}} is repeated?

---

Listings code

\lstset{basicstyle=\normalfont\ttfamily}
\lstset{flexiblecolumns=true}
\lstset{moredelim={[is][\normalfont\itshape]{/*}{*/}}}
\lstset{basicstyle=\normalfont\ttfamily}
\lstset{flexiblecolumns=false}
\lstset{moredelim={[is][\ttfamily]{!?}{?!}}} 
\lstset{escapeinside={�*}{*�}}
\lstset{firstnumber=last}
\lstset{moredelim={[is][\ttfamily]{!?}{?!}}}

---

Last lines code

\def\toc@headingbkORrp{% 
  \def\toc@heading{% 
    \chapter*{\contentsname}% 
    \@mkboth{\spacedlowsmallcaps{\contentsname}} 
      {\spacedlowsmallcaps{\contentsname}}}} 
\@ifclassloaded{scrreprt}{\toc@headingbkORrp}{} 
\@ifclassloaded{scrbook}{\toc@headingbkORrp}{}

Answer 1

The second code block defines a macro that if executed sets the heading for the table for contents to be based on \chapter rather than \section. It then executes that code if the main class is scrrept or scrbook,

In most key=value setting setups calling the command multiple times or using one command with a comma separated list is a matter of style. The multiple command version makes it easier to comment out some of the settings when debugging perhaps. I would guess the duplicated setting is a harmless cut and paste error while setting up the package.