Right, this is a slightly annoying feature because something this happens, and other times it doesn't, very odd.
I paste a command into the terminal with a view to tweaking its arguments, and sometimes it executes the second I paste it. Sometimes it doesn't.
This ranges from embarrassing ( posting nonsensical comments on an IRC ) to dangerous.
How can I shut this feature off for good? I never, never, never want the terminal to auto execute when I paste to it.