LaTeX: More margin for \todo
Following lines increase the paperwidth and marginparwidth. This gives \todo more space in the margin, w/o changing the original textwidth and linewidth:
\paperwidth=\dimexpr \paperwidth + 6cm\relax
%\oddsidemargin=\dimexpr\oddsidemargin + 3cm\relax
%\evensidemargin=\dimexpr\evensidemargin + 3cm\relax
\marginparwidth=\dimexpr \marginparwidth + 6cm\relax