Run Compass with --sourcemap flag

Does Compass support the --sourcemap option in Sass yet? I would like to run Sass through Compass. I have

sass_options = {:sourcemap => true}

in my config.rb, but when I run compass watch in my project folder no sourcemap files are generated. On the other hand, when I run

sass --compass --sourcemap --watch scss:css

The source file is generated, but the config.rb is ignored.

(For anybody wondering what a sourcemap is, it's a file that allows Developer Tools inspector to point to the origin of a style in a Sass scss file when you inspect an element.)