biblatex und caption: Zitate in Abbildungs- und Literaturverzeichnis aufführen

\documentclass[paper=15cm:20cm,listof=flat]{scrartcl}

\usepackage[ansinew]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[ngerman]{babel}
\usepackage[autostyle]{csquotes}       \usepackage[margin=10pt,labelfont=bf,font=footnotesize,figurename=Abb.,tablename=Tab.,format=plain,listformat=simple]{caption}
\usepackage[list=true]{subcaption}
\usepackage[useprefix=true,uniquename=init,sorting=nyt,seriesformat=standard,idemfont=normal,idembib=true,style=authortitle-dw,nopublisher=false,backend=biber,shorthandinbib=true,ibidtracker=context]{biblatex}
\usepackage{filecontents}

\begin{filecontents}{TestBib.bib}

@book{Dante2007,
author = {Dante Alighieri},
title = {Die Göttliche Kommödie},
gender = {sm},
location = {Stuttgart},
year = {2007},
translator = {Hermann Gmelin},
shorthand = {Alighieri 2007}
}

@book{Roettgen1997,
author = {Steffi Roettgen},
title = {Wandmalerei der Frührenaissance in Italien},
volume = {2},
subtitle = {Die Blütezeit: 1470--1510},
year = {1997},
location = {München},
gender = {sf},
shorthand = {Roettgen 1997}
}

@INBOOK{Andreani2006,
pages = {15--17},
title = {La Cappella di San Brizio e il Giudizio Universale di Luca Signorelli},
year = {2006},
editor = {A. Cannistrà},
author = {Laura Andreani},
booktitle = {Le stanze delle meraviglie},
location = {Cinisello Balsamo},
gender = {sf},
shorthand = {Andreani 2006}
}    
\end{filecontents}

\addbibresource{TestBib.bib}

\DeclareFieldFormat{shorthandinbib}{#1}
\renewcommand*{\shorthandinbibpunct}{\newline}
\setlength{\bibhang}{2em}   
\usepackage{xcolor}
\definecolor{darkblue}{rgb}{0,0,0.5}
\usepackage[colorlinks=true, linktocpage=true, linkcolor=darkblue, menucolor=darkblue, urlcolor=darkblue, citecolor=darkblue]{hyperref}
\usepackage[hyphenbreaks]{breakurl}

\DeclareNameFormat{sortname}{%
\usebibmacro{name:first-last}{#1}{#3}{#5}{#7}%
\usebibmacro{name:andothers}}
\DeclareNameFormat{default}{%
\usebibmacro{name:first-last}{#1}{#4}{#5}{#7}%
\usebibmacro{name:andothers}}

\begin{document}
\listoffigures
\begin{figure}[!htb]
\subcaptionbox[{\cite[2]{Dante2007}}]{Erstes Bild}
{\rule{0.48\textwidth}{1cm}}\hspace{0.02\textwidth}
\subcaptionbox[{\cite[6]{Roettgen1997}}]{Zweites Bild}
{\rule{0.48\textwidth}{1cm}}
\caption[]{Zwei Bilder}
\end{figure}

Hallo\autocite[72]{Roettgen1997}

\begin{figure}[!htb]
\caption[{\cite[4]{Roettgen1997}}]{Drittes Bild}
\end{figure}

\begin{figure}[!htb]
\caption[{\cite[4]{Andreani2006}}]{Viertes Bild}
\end{figure}

\printbibliography

\end{document}