you edge about anons without having any idea what's in our heads
here's my process, if it helps: if i get the "over 751 posts" message, i then look in my post for ">>" and if I've referred to another post, I add "(pb)" after it (yeah it MIGHT be the last bread but i tend to be a slow reader!).
THEN i copy it, and when I paste, it's all set!
code to add this automatically would be awesome, i'd even contribute it if someone points me to the code.