Has there been a hack for this already? I used to have an older version of UBB (classic) which had it, and wonder why they took this out of the basic functionality of UBB.threads .
This would need to be configurable by the users, like on the newpost.php and other pages where you would want to 'turn it off' while posting or replying.
Probably just adding a radio button down by the 'I want to preview my post and/or attach a file" section would work great!