Gnome Terminal 3.16.1 (as in f22) doesn't support middle-click pasting of the selection, even though I: (1) Have set Middle-click Paste to ON in gnome-tweak-tool, *and*: (2) have the following in my ~/.config/gtk-3.0/settings.ini:
[Settings] gtk-application-prefer-dark-theme=0 gtk-enable-primary-paste=true
See https://wiki.gnome.org/Apps/Terminal/FAQ#How_can_I_make_middle-click_paste_t...
Obviously not a shostoper, but rather annoying. (I'd use KDE konsole. but it doesn't handle the scroll wheel, which I've gotten used to.)