Mauro, I really appreciate your feedback!
I've just created a "full" composer.json
file, so you can just grab it and remove what you don't need:
https://github.com/wpmetabox/library/blob/master/composer/composer.json
I'm trying to do what you say for the settings panel. I have an idea of building that based on Composer. Another option is improving the Meta Box AIO to support all free plugins. Either way, there's some work to do 🙂