KOMAscript - Table of content TOC without dots for sections

Option sectionentrydots is provided by class scrartcl, but not by the classes with chapters.

But you can use \RedeclareSectionCommand:

\RedeclareSectionCommand[
  toclinefill=\hfill
]{section}

Example:

\documentclass{scrbook}
\KOMAoptions{paper=156mm:234mm, BCOR=8mm,twoside,
    headinclude=false, footinclude=false, 
    headings=normal,
    chapterentrydots=false,  % default
    }
\RedeclareSectionCommand[
  toclinefill=\hfill
]{section}

\begin{document}
\tableofcontents
\chapter{one}
\section{oneone}
\end{document}

Result:

Note that there is also \RedeclareSectionCommands:

\RedeclareSectionCommands[
  toclinefill=\hfill
]{section,subsection}

Then both sections and subsections do not get the dotted line in TOC.

You can redefine the command responsible for the leaders:

\documentclass{scrbook}

\KOMAoptions{
  paper=156mm:234mm,
  BCOR=8mm,twoside,
  headinclude=false,
  footinclude=false,
  headings=normal,
}

\renewcommand\TOCLineLeaderFill[1][]{\hfill}

\begin{document}

\tableofcontents

\chapter{one}
\section{oneone}

\end{document}

For finer control, you can load the tocbasic package (part of the KoMa-script bundle) and use \DeclareTOCStyleEntry.