Okay, I don't speak english so well but I hope you understand.
The thing is:
You could say things for your constacts!
Example (this is evil but you could do funny things instead):
(3 contacts in the canversation)
Me: Yo user2, I know that user1 hates you!
(I typed "/xsayfor user1 "I hate you user2")
user1: I hate you user2
user1: Wtf I didn't say that!
user2: I saw it myself, I hate you to!
so the thing is that i switches name to whatever User1 has choosed, says "I hate you" and then switches back to my normal name!
I hope someone understanded, Thanx