Just so you know, you have two options for that as well.
1. Plus has the option in which you will have your contact as a little box on your screen like ICQ. You can chat with your contact by double clicking the box.
2. You can right click the MSN icon in the systray and choose send an instant message. I know it is not as good as hotkeys by anyways, but a lot easier than open contact list. I use this a lot with my contactswho are not on desktop (from option 1).
It seems a good idea, though I got good enough options that I won't bother using it. Nice work though.
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