When the keyboard is blocked it is also impossible to use the media keys to control the audio volume, brightness and audio player.

A complete list of media keys that should never or optionally be blocked is:
- volume up
- volume down
- volume mute toggle
- play/pause song
- stop song
- next song *
- previous song *
- brightness up
- brightness down

* Perhaps "next song" and "previous song" should always be blocked too to prevent the user continuing keyboard activity.

See also https://bugzilla.gnome.org/show_bug.cgi?id=422390

Implementing this would allow the user to change screen brightness, audio volume and audio player. Suppose the telephone is ringing and the music is loud while workrave is in a rest mode. This would allow muting the volume at least to be able to answer the phone.

I agree that this would be a very useful feature, though I'm not sure if it is easy to add to Workrave's keyboard locking...