creating menu items with children (sub items)
How about installing Menu attributes. See if it's nofollow option works. If not, still use it by setting a class of 'no-follow' on this particular menu-item. Then add some jQuery to you pages wherein you target the anchor tag related to this class for its click event and disable the default action. I don't think there should be a conflict as Superfish opens up menus on hover, I think? But try. And also set up the menu so that it points to the first child so that Drupal menu UI will accept.

How to Disable/Inactivate Some of the Non-Leaf Menu-Items (but keep their children visible and enabled/active)