Version 0.2.0 was just approved. (in a pretty speedy 3 days!)
The new version allows you to control DVD menus, toggle subtitles, languages, change speed and manage audio and subtitle delays.
The one important thing to note is that you will have to run the setup helper version 2.5 or higher for these commands to work.
If you set up VLC some time ago, or the new commands do nothing, then please just download the setup helper from http://hobbyistsoftware.com/vlc and run it again.