I'm sitting here and a thought came across my mind. I know that for the most part the current style system is based on HTML and BML. I don't find the current interface very good. I've tried editing styles in UltraEdit32 ( a text editor ) and then doing a cut / paste from the editor into the style system. What would really be cool is if there would be a way to edit the style completely within a client, and then upload it using this client. You could also include some form of a test / preview option so people can see how the style will look before they go and upload it to the server.
Like I said, I'm not sure what direction the new style is going, but I'd thought I would throw this out there as an idea.