One thing that's irked me but I've never reported for some reason is the CSS auto-indentation.
Although it indents nicely for the most part (barring the "if you wrap onto two lines it doesn't indent properly" throughout WeBuilder bug I reported a while ago), the first line of the CSS never seems to indent.
Although it puts an indent in when it automatically creates the braces, if you go back later to add a first line to the CSS it doesn't indent and you have to indent it manually. It'd be nice if WeBuilder could look at the lines after it and if they're indented it indents the first one too.