All the menus and toolbars in the application can be customized using the customization menu on the end of each toolbar
The toolbars available in a given editor can be selected using the toolbar tab.
Menus and toolbars can be modified by dragging commands from the dialog onto the toolbar or menu where you want them.
This includes the External Tools.
Keyboard shortcuts can also be re-map using the Keyboard tab
Keyboard shortcut 'Chords' are not supported.
Changes to External Tools may not be reflected in the menu editor until after the application is re-started.