Sure, it's useful, but if I'm being completely honest, chances are I would never in my life turn it on.
I spend a LOT of time on the DM client, and I'm usually pretty much always doing something. If I'm not doing something, I'm taking a break for my head and eyes. This would be no more likely to get my attention for help than simply asking in the DM channel. The only thing I see coming from this is more people asking for personal RP attention, constantly, and I don't know if anyone can manage that any better than we already try to at the moment.