\hyperlinkframeendnext in beamer-Klasse möglich?

\documentclass[12pt]{beamer}
\usepackage[utf8]{inputenc}

\makeatletter
\newcounter{@countingframe}%
\setcounter{@countingframe}{0}%
\def\beamer@framepages#1#2{%
  \ifnum\c@page<#1%
  \else%
    \ifnum\c@page>#2%
    \else%
      \gdef\beamer@startpageofframe{#1}%
      \gdef\beamer@endpageofframe{#2}%
    \fi%
  \fi%
  \stepcounter{@countingframe}%
  \expandafter\xdef\csname frame@\the@countingframe @end\endcsname{Navigation#2}}

% define \hyperlinkframeendnext, which will point to the final slide
% of the next frame (or the current frame if it's the last one in the
% presentation)
\def\hyperlinkframeendnext{%
  \@tempcnta=\c@framenumber%
  \ifnum\@tempcnta<\inserttotalframenumber%
    \advance\@tempcnta by 1%
  \fi%
  \expandafter\hyperlink{\csname frame@\the\@tempcnta @end\endcsname}}
\makeatother

\setbeamertemplate{navigation symbols}{\scriptsize\hyperlinkframeendprev{ $\vartriangleleft$ }\hyperlinkframestart{ $\vartriangle$ }\hyperlinkframeend{ $\triangledown$ }\hyperlinkframeendnext{ $\vartriangleright$ }}

\begin{document}

\begin{frame}
  1\pause 2\pause 3
\end{frame}

\begin{frame}
  A\pause B\pause C
\end{frame}

\end{document}