How about...

[jonnoman]

Once a question has been answered, the person who posted the question can click a button to say its been answered.

I know people like to carry on and discuss questions, but its a nice little notifyer to let us all know :)

[Ethel]

That would be good if it was displayed in such a way that we didn't need to even click on the question to see if it had been answered.

[jonnoman]

Yeah that what i mean.

[sir.knobby]

We have had that function for ages now but it has never worked.

Surprize surprize

[jen78]

It would be really good for people to put an end to threads which fall prey to abuse and arguments and such too.

Even if people are determined to carry on then that new independent thread is easier to ban rather than banning the original question which is usually harmless, just overtaken by idiots.