It's the front end I use for my collection, we've already discussed it: https://chamconsoft.com/cmc/
I only use MC as a player (not as a front end / collection management), as I use MyMovies and its bridge player capabilities to control my Oppo Clone and my Dune mediaplayer using the MyMovies iOS app as a frontend for network playback for these players, and CMC itself as the front end / Movies wall for my HTPC, all with the same metadata.
It's nice to see other people using MC as a player / renderer primarily! Your software looks pretty nice, I'm glad you have something that you like. I did something similar myself. Nothing else looked the way I wanted and nothing else had what I would call 'exhaustive' metadata, database performance was also a consideration for me (I've gotten semantic plot search down to about 15ms which I consider pretty good, and more traditional search is about 1-3ms). Redis FTW. I dunno, the semantic search thing is cool, "some commandos fight an alien in the jungle" does indeed return Predator (and some predator rip offs too!)
I'll be messing around with the new MCC command possibly. Right now, on the 'cinema' renderer machine, I hide and show JRiver (plus switch around queues / zones so that there's content for start, idle and finish states)