Make \addlinespace globally to work with all tables

I found that useful command \addlinespace[3pt] to create an extra white border around the rows. See example:

\documentclass[a4paper]{report}

\usepackage{multirow,booktabs}
\usepackage[table]{xcolor}
\begin{document}

\begin{table}
\rowcolors{1}{gray!15}{gray!15}
\begin{tabular}{rrrrr}
\rowcolor{gray!50}
Row1  & a     & b     & c     & d \\
\multicolumn{1}{c}{} & a1    & b1    & c1    & d1 \\ \addlinespace[3pt]
\multicolumn{1}{c}{\multirow{-2}[0]{*}{Multirow1}} & a2    & b2    & c2    & d2 \\
Row2  & aa    & ab    & ac    & ad \\
\end{tabular}
\end{table}

\end{document}


I also found commands like:

\setlength\extrarowheight{7pt}
\renewcommand\arraystretch{1.2}


But these two commands seem to just expand the whole row rather than that white border thing. However, you call it ;)

As I have a lot of tables with loads of rows, my question is how to make the command \addlinespace[3pt] globally so that I do not have to add it at the end of each single row for all tables.

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\renewcommand\arraystretch{1.2} increases the whitespace above and below the row. \setlength\extrarowheight{7pt} only above! – Herbert Jan 8 '13 at 13:18

I'm not so sure you want this additional space between all rows, particularly those where a \multirow is involved.

However, stating \global\everycr{\addlinespace[3pt]} in the first cell will do; remember to restore \everycr to its empty usual value at the end.

\documentclass[a4paper]{report}

\usepackage{multirow,booktabs}
\usepackage[table]{xcolor}
\begin{document}
\begin{table}
\rowcolors{1}{gray!15}{gray!15}
\begin{tabular}{rrrrr}
\rowcolor{gray!50}
Header & 1     & 2     & 3     & 4 \\
Row1  & a     & b     & c     & d \\
\multicolumn{1}{c}{} & a1    & b1    & c1    & d1 \\\addlinespace[-3pt]
\multicolumn{1}{c}{\multirow{-2}[0]{*}{Multirow1}} & a2    & b2    & c2    & d2 \\
Row2  & aa    & ab    & ac    & ad \\
\end{tabular}
\global\everycr{}
\end{table}

\end{document}


Notice that I put a countermanding \addlinespace between the two rows sharing their label.

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