How to use code completion on SCSS files in IntelliJ IDEA 10.5?

In general SCSS files are CSS files with some special features. When i want to edit a *.sass file in my project i noticed that IntelliJ knows that file type but there i开发者_开发百科s no code completion at all. I know IntelliJ has code completion for CSS files.

Just going to "IDE Settings" / "File Types" / "Cascading style sheets" and adding ".sass" and ".scss" to it, brings auto completion to this file for normal CSS.

Is there a way to enable (add) all the special features of sass to the IntelliJ auto completion for functions like "lighten()" etc., too?

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There are several tickets related to this in the JetBrains issue tracker, this one for example. Fortunately, it seems they plan on fixing it soon though.