IMHO menu item SaveHistory (like in konsole) will be nice and very usefull. At least for me. Redirect terminal's output to file is not convenient. but save it with 2 clicks is just cool.
Since vte 0.24 there is a function vte_terminal_write_contents(). However this is still disabled in gnome-terminal too since the call is not async, so I wait until that is fixed.
Implemented by https://git.xfce.org/apps/xfce4-terminal/commit/?id=f0ba2f35176018905bed2a349b8f5bbba7c5e2f7