Hi closser,
There is no simple option to achieve what you want, though you may want to check out the answer given on
answers.com.. It's not ideal and it's not really a very trustworthy source, so use it at your own risk.
Another alternative is to revert back to Windows Live Messenger 2009.
This seems to be a feature that Messenger Plus! might be used for. You could attempt to write it in as a "Feature suggestion." However there is but a small chance that it will be implemented in a future update and it may take months for it to appear if at all.