Awesome work! I loved the first Writemonkey and so far i'm loving this one as well!
I would prefer some alternative to the Command Palette. While it's great to reach any option by searching, being able to look at the options with your eyes is important. For a new user looking at what options is available to them, they either have to read the documentation, or scroll through the entire list of commands or possibly guess for terms and see what comes up. For example, i was trying to find how to adjust text size, but i couldn't find any way. Finally, after consulting the documentation, the option was found under "Zoom Font Size", which were terms i did'nt search for.
The F1 screen from writemonkey with a list of most important shortcuts, a classic tabbed settings page , or even just a menu bar could fix that to the point of new users not getting lost.