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\documentclass[a4paper,12pt,openany,oneside,pointlessnumbers]{scrreprt}
\usepackage[T1]{fontenc}
\usepackage[latin9]{inputenc}
\usepackage[ngerman]{babel}
\usepackage{mathptmx}
\usepackage{graphicx}
\usepackage{setspace}
\usepackage{titletoc}
\usepackage{tocloft}
\usepackage{jurabib}
\usepackage[a4paper]{geometry}
\geometry{left=5cm,right=1.5cm,top=2.5cm,bottom=3cm}
\usepackage{tocstyle}
\usetocstyle{allwithdot}
\usepackage{tocstyle}
\usetocstyle{allwithdot}
\addtokomafont{disposition}{\rmfamily} % Schriftart Times in den Überschriften
\chapterheadstartvskip
\setkomafont{chapter}{\normalsize\bfseries} %fett,normal
\setkomafont{section}{\normalsize\bfseries} %fett,normal
\setkomafont{subsection}{\normalsize\mdseries\itshape} %kursiv, normal
\setkomafont{subsubsection}{\normalsize\mdseries} %normal
\settocfeature[toc][0]{entryhook}{\usekomafont{chapter}} % Übernahme der Überschriftformatierung ins Inhaltsverzeichnis
\settocfeature[toc][1]{entryhook}{\usekomafont{section}}
\settocfeature[toc][2]{entryhook}{\usekomafont{subsection}}
\settocfeature[toc][3]{entryhook}{\usekomafont{subsubsection}}
\renewcommand*\thechapter{\Roman{chapter}}
\renewcommand*\thesection{\arabic{section}.}
\renewcommand*\thesubsection{\alph{subsection})}
\renewcommand*\thesubsubsection{\alph{subsubsection}\alph{subsubsection})}