The File Tab Menu is optional and Ribbon JS could be initialized without adding tools to it. This example demonstrates how to have a ribbon without File Tab Menu and Quick Launch Toolbar. Check the code for this example.
Use this document as a complete copy/paste reference for a ribbon configuration.
More Ribbon JS Demos
Check the rest of the demos. There's much more cool stuff you haven't seen yet. Thinking of a feature that you would like to see in Ribbon JS? Suggest it here and it will make it in the next release.