Current "Undo" acts on the document being edited; however, considering
configuration/look & feel modifications of the tool in the scope of the Undo
could be very useful, specially for new users afraid of operating the
computer: those changes cannot be undone.
For example, changing buttons, menus, appearancies, and general settings may
be hard to undone (if done by accident); this improves the learning process
of the tool, since an undo command is ready for going back to the previous