Add drop down indicator to menu

Hi, thanks for writing this plug-in! I would like to request a feature to add an indicator the category menu items. In the referenced page, I have two category menus “Category Manual”, and “Category Auto”. “Category Manual” has a post under it that was manually created in the menu editor, while “Category Auto” uses your plugin to automatically show posts. “Category Manual” has an arrow next to it to indicate that it can be expanded. I would like this arrow to appear for “Category Auto” as well.

The page I need help with: [log in to see the link]