No this feature isn't in the new Messenger Plus, however it is in the new BETA version of StuffPlug-NG -
www.stuffplug.com
However this feature is now very unreliable as it will give false notifications of people opening your window when in fact they haven't. A good example is when the other persons version of MSN Messenger tries to download a contacts display picture, however there are many more things that will give false notifications. Any notification you get must be tret as possibly untrue.