configurable font size for KCSS number on spine

kcssCover.sty

@@ -65,6 +65,7 @@
 \newcommand{\frontauthor}{\LARGE John Q. Postgraduate}
 \newcommand{\spineauthor}{\Large John Q. Postgraduate}
 \newcommand{\kcssnumber}{2011/1}
+\newcommand{\kcssnumberspinefont}{}
 \newcommand{\isbn}{}
 \newcommand{\researchgroup}{Fake Research Group}
 \newcommand{\backtext}{%
@@ -229,7 +230,7 @@ as an argument to the \lstinline|wrapfigure| environment, here 6.
   %
   \node [draw, rectangle, text width = \spinewidth, inner sep = 0mm, color = white, fill = techfakblue] at (lower center) [above] (spinebox) %
   {\begin{minipage}{\spinewidth}
-  \centering \vspace*{\spinepaddingtop} KCSS \\ \kcssnumber \vspace*{\bleedplusspinepaddingbottom}\vspace*{\smallerlargerheightcorr}
+  \centering \vspace*{\spinepaddingtop} \kcssnumberspinefont KCSS \\ \kcssnumber \vspace*{\bleedplusspinepaddingbottom}\vspace*{\smallerlargerheightcorr}
   \end{minipage}};
   %
   \draw