Have guests post as a specific member

So what I'm trying to create is have that when ever someone is a guest and not logged in when they post, have xenforo post under a specific specified user name, ex anonymous, guest, etc so you can see an overall history of guests on the guest member profile.

would anyone know where to start?
Yeah, it looks like I had the same idea as zaiger in the thread you posted. Addon development time ! Would you know where to start? this addon seems like a relatively simple change, but it sure it will take quite a while for me.