X that wont work for him unless his nick is in the command itself because you did isin...
but the answer to your question dude if you just want it to describe to only certain things do this
on *:ACTION:*:*: {
if smacks isin $1- { describe $chan smacks $nick in the face }
}
otherwise you cant really have it seperated you can tell your script which commands you want it to respond too
