Prevent coffeescript syntax highlighting fields as global variables

Hi, if i write a method on a class:

_handleClick = (e) ->
     if e.currentTarget is blah...

'currentTarget' is highlighted as a global variable... or it is covered by a setting I've not been able to find yet. Primarily, i want to change the highlighting so that global variables are highlighted differently from non-globals, how can I do this?
IntelliJ IDEA 13.1.1

~gilbert