It's not a bad idea, but I'd rather keep my text buffer as clear as possible. By making it easier to basically IM people you were just engaged with, your opening the door to the normal "You warped", "Vulch", "cheater" whines.
A perma-squelch list would prevent this, but who wants to be bothered contstantly adding names. I just want to fly. I don't care what my enemy has to say, be it an insult or a compliment.
Sorry, just not my cup of tea.