Couple of quick suggestions:
-Quickly disable the keyboard hook or revert the keys to their original state when control or alt is pressed, so that for example, if you press control Q, you don't have to press y. Just something to add if there's nothing else really.
-If you want to expand this program and really make good use of your code, make a binding system. Quite easily, you could make the surrounding keys execute either macro actions or just press another key/sequence of keys/sendText =p.
-Perhaps allow changing of the talk key?
You could do all this load from a .cfg file if you really don't want to make a window.
Just my suggestions,
Awesome idea for a program mate.