I doubt I will be making much if any use of such a feature. But could be a nice extra for some people who really want this. Personally I disable the message notifications as well while gaming.
If I really wanted this I already have my laptop in my living room... But if I do receive a phone call or something I pause the game... Voice communication within a game like Warhawk can add to the online gaming experience (within Playstation Home, etc this can also be useful), but talking with people who play an entirely different game than you're playing seems a bit useless to me personally.
I am a bit surprised many people request this instead of for instance instant video pop-up messages (for instance which can be disabled for specifically gaming, movie watching, etc) or something as simple as an agenda with alarm and popup notification functionality. I can imagine so many different features, which seem more useful or interesting to me than this one.







