Again, I don't mean remove the ability to edit it, I mean by default it copies the OP heading.
AFAIK, the subject heading does copy that of the OP when someone replies to it. Then one can change it if they want to. The subject heading above this reply now mirrors that of your original post without me editing it.
Is that what you mean or am I getting it wrong?
Edit:
Read the title of my post. This is what he means.
It took me a while to get the point. I believe the OP was asking for a feature that allows replies to show the original thread title and not that of the post it is quoting, even if the quoted post has an edited title.