I would like to be able to use Command arrow keys to navigate by word like you can with Ctrl. I've disabled the Mission Control mappings already. What's the easiest way to remap?
You can change the default keybindings for OS X text editing with the DefaultKeyBinding.dict file. Make a new text file at
Restart or log out and in, and controlleft and controlright should do what you're looking for. This will work in most OS X apps, but there are some (typically third party text editors) that use their own bindings, which will need to be switched on a case-by-case basis.