In addition to what everyone else has said, something I'd find really useful would be going in the other direction. Just mark some keys and it tells you what chord you're playing.
Thanks for the feature request! I've had this feature request many time, it's on my list. But like UncleMeat said, it's a bit trickier because there isn't a 1-1 mapping. So I'll have to find some elegant UI pattern for this. I want to keep Note Kitchen very minimal and simple so I have to be careful about too many menus and buttons, etc.