A slight step further than that would rock. If the groups and such you create as part of the control panel could be selectable as private note targets. So a DM could, say, make a group of everyone that speaks Draconic, and then just post to "Dragon Talkers" or something of that nature. I'm sure the code behind my thought is WAY worse to try figuring out than Knife's, but hey a boy can dream yeah?
Just spitballing, Keleth :) I find it frustrating that I have to look up how to spell a username everytime I send a note (which I do a lot, especially in my Cthulhu games) so this would be a huge help (after, of course, the Warhammer character sheets :)