Adding the ability to check for key combinations could be used to invoke other actions like cycling through all the operators, voiced, non-voiced users to filter tabbing if your in a room with tons of users. Or to invoke spell checking on the current word/sentence. Overall, I think it would an editbox a bit more versitile by displaying information quickly (like pressing TAB+T to fill the editbox with the current channel topic. Putting the same feature to the on input event could be interesting as well... thats definately something to think about.
