Similarly, right now, when I'm writing this post, I'm also adding some extra text "(By: PowerGlove)", in the Subject of this thread that you can see when I post this.
Now, I wonder why a poster is allowed to make changes in the Subject of a thread? I mean, if I have created a thread and chose a subject line for it, it should be only me who should be allowed to change that if I ever want to and not those who are going to post in my thread.
So, my suggestion is that when a poster is about to post something in a thread, or if they want to modify a post, the textbox in front of the "Subject:" should be closed for them, so that they don't get to make any changes in the subject when they are making a post. That textbox should only be available for the creator of the thread so that if the creator wants to make a change in it, they should be able to do it, but posters shouldn't be allowed to do that.
That's it. Let me know what you guys think.

Your change of Subject here is only visible in your post, not in the topic listing of Meta.
P.S. Had to edit the Subject when I quoted you, because my quote reply inherited your change of Subject and I overlooked it first.I don't like your proposal, as I sometimes "fix"
deliberately the Subject
deliberately when the OP has chosen a really bad Subject or I want to add an additional
emphasizeemphasis. I rarely do this, though.
The idiot who applied to a lot of signature campaigns by trying to fake them as [OPEN] is just plain stupid and earned his spot on every campaign manager's blacklist.
Frankly, I don't really see a point to disallow a change of the Subject by any poster when this change is limited to the user's own post, unless he's quoted and the quoter keeps the change. This doesn't update the Subject of the topic
in the topics listing, this can only
do the OP
do or moderators/admins.