For whatever reason, Dreamwidth’s default rich text editor (built on an old version of FCKEditor) hides a lot of the available toolbar buttons. I’ve written a quick userscript that enables all available buttons in the editor, and also increases the height a bit to make writing more pleasant. I’ve tested it on Firefox with GreaseMonkey; presumably it should work on Chrome/Chromium as well.

// ==UserScript==
// @name        Better Dreamwidth Editor
// @namespace   betterdweditor
// @include     https://www.dreamwidth.org/update?usejournal=spindas
// @include     https://www.dreamwidth.org/editjournal*
// @version     1
// @grant       none
// ==/UserScript==

window.onload = function () {
  var frame = document.getElementById('draft___Frame');
  frame.onload = function () {
    document.getElementById('draft___Frame').style.height = '600px';
  };
  frame.src = 'https://www.dreamwidth.org/stc/fck/editor/fckeditor.html?InstanceName=draft&Toolbar=Default';
};