Please consider adding submenu-open class to the parent menu item. I am seeing this on some well made sites. This would enable further customization of the menus design, in particularly visually connecting a parent menu item to its children.
Like other common site navigations Responsive Menu has clickable trigger icon’s in the menu that allows a visitor to expose/hide sub-menus inside a parent menu. The idea is that the parent element should have two separate stylings depending on whether its sub-menu is exposed or not.
As far as i can tell this is not possible to do with Responsive Menu but I may be wrong as I am only an amateur level web-developer. Nevertheless, this type of styling seems common on modern sites and I think it may be a good addition to Responsive Menu.
It would make it possible to style the menu with a visually intimate connection between a parent menu and it’s sub-menu. For example we could make the parent drop a shadow down over its sub-menu when it becomes exposed.