Non-parent accordion headers need special class

I just downloaded and tried this. One problem I see is that there is no special class set to differentiate parent from non-parent accordion headers. There should be a class set on non-parent headers so you can style them differently (for example, put an arrow next to the header name indicating to the user that the header has subitems). The way it is now, the user has to hover over all headers to find out which have subitems.

Menu items (under the accordion headers) that do not have any children are assigned the classname "leaf," so they can be styled differently from items that have children. Accordion headers should be the same. (My apologies if I have missed something here.)