Custom plugin for wordpress

I have a website that I'm building at [login to view URL] and my client has a huge long menu that needs to be displayed. I would like a wordpress plugin written that is exactly like the "simple retail menus" plugin [login to view URL] however it also needs to create a menu automatically that I can shortcode on to the page and then style. The menu should work like this: [login to view URL] where by clicking the item in the selectorbox the food menu scrolls to the appropriate location. I have attached a screenshot of the website with my desired effect. I need this plugin to work so that when my customer adds a new section to them menu, the menu automatically populates and she doesn't have to rely on me to come back and recode the selector menu. I have included the screenshot and the theme files. If you have any questions, please contact me. Again I stress that the selectorbox must automatically populate with the appropriate created headings of the menu. I appreciate the help as I'm pressed for time on this project.