Great news it supports technologies like CSS, DHTML and Ajax as well. Good to know that this editor supports enriching your code thanks to the availability of a library of JS objects, variables, functions and snippets. Luckily, the tool is well-documented. In this respect, there is plenty of useful information available from its web page.
In terms of interface design, the editor surely needs fixing. Unfortunately, this is not one of those tools you can use right away. So, you could need some time to explore the different features before you can find them without much trouble. There is a panel that allows you to browse through directories and the library, including such objects as buttons, menus, cursors and forms.