Indeed @VertigoRay , this would be very powerful, and it can be extended quite a bit. What I meant by filtering out things that could be destructive is: Don't make commands available in "mid-text" that would somehow clear the text, that's all. So, yes, I agree with you 
(As for my question about /away, @VertigoRay, what I meant to ask is if I could attach a message to it, like /away Going for lunch)