You have probably noticed small "plus" icon in top right corner of posts editor.
That icon leads to latest addition to Misago feature set: Zen Mode
Zen Mode helps you focus better on what you want to say in your post by maximizing editing area and hiding all interface elements but small toolbar with most common formatting tools for you to use. In addition to that screen-big edition area and larger font makes it easier to backtrack and change long text.
Initial implementation also makes great starting point for expansion into "advanced editor" that would contain more edition tools that standard compact editor, however currently this is just an idea I am bouncing around.