It would be really cool to see the effect of a selector style on the element before you select it the selector name.
In other words if you select an element (Div, Section etc) then say the item is a Header item, then you type out "Header" in the selector list to reveal all the available header styles, then you could go through them and see what your element will look like. Instead of going through them one by one.
You already do this when replacing an image and cycling through the images in the image library.
I feel this would make choosing the correct style much quicker and also help nail down styles that need a global tweak.