But considering that a post is the one basic element the whole board is made of, cloning a post in order to modify and then merge or open a new topic with that clone should imho be a standard, inbuilt function in phpBB.
As written in the above link:
... If we need to clone a post, which happens several times daily, we are now forced to clone a whole topic of several pages into a hidden forum. Then we have to delete all it's posts except one to finally have a clone of the desired post. Which then has to be moved to it's final destination.
Some posts also need to be tripled or even quadrupled - imagine the waste of time and the potential of mismanagement!
I'll post this same topic also in the area51 phpBB 3.x discussion, but fearing that it might be too late to be integrated there, I wanted to make sure that this request is being heard for phpBB 4.