My idea was that if you're pasting a single line, then at least you can review the command you pasted before hitting enter.
I've tried various ways of input to my console (MINGW/WinXP) for multiline pastes, and the results are as follows: 1. Right-click multiline paste: unsafe (executes immediately) 2. Windows paste (alt-space, e, p): unsafe (executes immediately) 3. Insert or Shift-Insert: safe (pastes only the first line)