\documentclass{article}
\usepackage{pdfpages}
%\VignetteIndexEntry{5 - list of parameters}

\begin{document}
\SweaveOpts{concordance=TRUE}
\includepdf[pages={1-2}, fitpaper=true, rotateoversize]{listofparameters.pdf}
\includepdf[pages={3-}, landscape=true, fitpaper=true]{listofparameters.pdf}
\end{document}