Globally override key binding in Emacs

Question

How can I set a key binding that globally overrides and takes precedence over all other bindings for that key? I want to override all major/minor mode maps and make sure my

Answer 1

If you want to "always use the keybinds in the map, unless I explicitly override them for a specific mode-map", and assuming you are using scottfrazier's approach, you want:

(defun locally-override (key cmd)
  (unless (local-variable-p 'my-keys-minor-mode-map)
    (set (make-variable-buffer-local 'my-keys-minor-mode-map)
         (make-sparse-keymap))
    (set-keymap-parent my-keys-minor-mode-map 
                       (default-value 'my-keys-minor-mode-map)))
  (define-key my-keys-minor-mode-map key cmd))

So

(locally-override "\C-i" nil)

should remove the "\C-i" binding from the minor mode in the current buffer only. Warning: this is completely untested, but seems like the right approach. The point of setting the parent rather than just coping the global value of my-keys-minor-mode-map is so any later changes to the global value are automatically reflected in the local value.