Good point. I'm just used to joomla where in some themes (such as those from Rocket Theme) they put certain things in the body-like the menu item name. It's really handy for certain things.
the other really nifty tool is something called Advanced Module Manager which can be used to load modules (similar to blocks) on different pages based on all kinds of crazy criteria. you can literally load stuff for a single user if you want.
Anyway, was just brainstorming today and thought of this as a nifty way to customize things based on role.