Enable Emacs-like keybindings scheme for all QT applications

As for GTK apps under Gnome environment it's possible to set all applications to use Emacs-like input scheme:

$ gconftool --set -t string /desktop/gnome/interface/gtk_key_theme Emacs
$ gconftool --get /desktop/gnome/interface/gtk_key_theme
Emacs

I wonder if it's possible to adjust input for all QT apps in a similar way.

KDE doesn't use registry tools such as gconf everything done by system settings, but you can try kwriteconfig to set global environment for KDE applications. But I'm not sure either. You can read Hidden KDE Options and Features tutorial.

Solution for Unity:

gsettings set org.gnome.desktop.interface gtk-key-theme "Emacs"