This would probably avoid threads being hijacked all the time, which I detect almost daily.

I too made the same mistake just before, because I pressed "NEW REPLY", since it was the only button that's there in single thread view!
(The "NEW TOPIC" button is only available in thread overview!)

At least this would make us able to view a particular thread and then abruptly stop reading and putting up a new topic.

Thanks in advance for considering this (if so).