I use both the command-line and Mac App store versions of MediaInfo, but I don't like keeping track of both when new versions are released. Is there some way to update both at once when a new version is released? For example, if there were a command-line app inside the MediaInfo.app package, I could symlink that into /usr/local/bin.
Current deliverables definitely don't provide the best user experience about updates.
Adding the command line version into the Mac App Store is a good idea.
I was also thinking to add the command line options to the GUI (if the binary is called with some parameters, consider a command line output is expected).
On the (long) todo-list, I don't know when I (the main developer) will look at it, but if someone else is interested in proposing something...