We now support the ability to choose define a mobile only menu for your stores mobile display. Choose the colors for your menu along with the pages, departments and/or items to link to from the mobile menu.
To configure your mobile menu visit:
Design–>Mobile Site Settings
First make sure that the mobile version is enabled.
Next check the box labelled Show Popup Menu
Choose the departments, items and pages to include in the menu in the same manner as is done for the navigation menu bars.
Under the Color Scheme settings choose the colors for the popup menu in the fields labelled Popup Menu Background and Popup Menu Font Color
Select Save Changes