Canned messages?
 

Is there a mod out for Canned Messages for vB3?

You mean like the you are unliscenced user? lol

edit: I wonder if it could be achieved using custom phrases and an edit in the bbcode parser to post it.

Yeah, like that

Hey good idea with the BBCode
I got it to work :-D

cool. so what do you enter just [custom][/custom] with nothing inside?

Here's what I did
Title: Accepted Client
Tag: acc
Replacement Use Option: Yes

Now, what you have to do is when posting a message just put [acc=name]aaaaaaaaa[/acc] and the message you want will appear. You don't have to put a real message in between the BBCodes.