According to the docs http://sublimetext.info/docs/en/reference/key_bindings.html?highlight=alt
What happens by default with alt-alphanum is that a symbol is inserted. While this is the default OSX text field behavior, it'd be nice if it could be disabled so that more unix-like or emacs-like commands could be used. For example, alt-b (backwards word), and alt-f (forwards-word)
Is there a plugin workaround to this, or planned feature in future releases?