Remove close buttons on individual tabs and replace with a single close button on the right of the tab bar when the "Show 'New Tab' and 'Close Tab' buttons on tab bar" option is enabled - which brings tab management back to the way it was in KDE 3.

Several users (esp. those working with laptop trackpads) were having problems with accidentally closing tabs.
It seems KTabBar's close buttons need some refinements before they can be used in the terminal.