It's so confusing when somebody changes the Subject line of an active topic. It's not only confusing for one willing to watch an interesting conversation, but also a way for some interesting topics to loose their audience...

I'm sure that the entire Forum will benefit if the Administrator will uncheck the "Allow to change the subject" in the forum engine's options. If someone wants to change the Subject of somebody's conversation, - it's logical, polite, and easy enough to start a new Topic with some quotation from an inspiring one, rather than hijacking it.