When including marginpar and/or todonotes marking text in a PDF viewer always selects the body of the text and the note together:

Some of us unfortunately have collaborateurs not using LaTeX and hence they prefer to copy & paste large chunks from the PDF to Word to edit the places. Hence my question: Is it possible to make text selectable per "column". I.e, either select the body OR select the note?

If that is not possible, one alternative would be to make the note completely inselectable using accsupp (although the other way would be preferable). But accsupp does not appear to work for todonotes, but it works for marginpar.
\documentclass{scrartcl}
\usepackage{todonotes,accsupp}
% Does not work
\newcommand{\mytodo}[1]{\todo{\BeginAccSupp{ActualText={}}#1\EndAccSupp{}}}
\begin{document}
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras in neque
felis.\todo{In viverra luctus metus id elementum. Class aptent taciti
sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos.}
Pellentesque bibendum, nisi ac rhoncus tincidunt, tortor velit egestas
erat, nec cursus lectus lectus non leo. Suspendisse et leo eros, id
malesuada risus. Etiam commodo quam a magna pulvinar vehicula vestibulum
lacus blandit. Aliquam id tortor non tellus laoreet dictum. Aenean
eleifend, arcu a vestibulum vulputate, orci tellus sodales ante, nec
convallis orci lacus ac erat. Sed lacinia justo vitae ligula euismod
auctor. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices
posuere cubilia Curae; In viverra luctus metus id elementum. Class aptent
taciti sociosqu ad litora torquent per conubia nostra, per inceptos
himenaeos.\marginpar{\BeginAccSupp{ActualText={}}In viverra luctus metus
id elementum. Class aptent taciti sociosqu ad litora torquent per conubia
nostra, per inceptos himenaeos.\EndAccSupp{}}
Sed convallis tincidunt justo sit amet fermentum. Vestibulum ante ipsum
primis in faucibus orci luctus et ultrices posuere cubilia Curae; Nulla at
velit metus, ut blandit sapien. Maecenas lacinia congue sem, et pulvinar
arcu iaculis molestie. Lorem ipsum dolor sit amet, consectetur adipiscing
elit.
\end{document}
todonotes. – Jörg Dec 04 '12 at 13:35