I recall that the need for a separate preference pane to enable controlling VOX with the media keys was due to Mac App Store sandboxing restrictions. While this was a good workaround to those restrictions, I would like to see this options included in the standalone version of VOX, so we wouldn't need a separate preference pane when using that version.
Some of us are currently experiencing problems with "VOX preference pane" preferences not saving properly, and I believe that having them in a separate module is only making it easier for problems like this to arise.