Coffee script syntax highlighting issues

Hi, there are a few discrepancies i have seen in the CoffeeScript syntax highlight (I'm using IntelliJ IDEA 12.1.4)...

when using the existential operator, the local variable syntax is lost:
if localVar?
  do someting...
In the above, localVar will no longer be hilighted as a local variable

using destructuring assigment in a class prototype method,
init: (opts) ->
  {@name, @age, @height} = opts
causes IDEA to mark the three vars @name etc with "Unresolved variable or type", whereas the long method
  @name = opts.name
  @age = ...
is fine


finally - a question:
How do I set the syntax hilight for parameters in coffee script? Mine is simply white itallic:

• Changing the language defaults for parameter has no effect
• Coffescript itself has no setting for parameter