I have a long list within one of my menus and when expanded, it causes the page to grow very long, past the footer in fact. I was wondering whether there was a way to add a scroll feature to the menu list so that it could be say, 10 items long but clicking on a scrollbar at the bottom of it would show the rest etc. Is anything like this possible?
this feature is not supported. you can order the script customization, but generally this situation indicates poorly designed navigation structure. Long submenus are difficult to navigate. Consider splitting the menu into smaller submenus or using tree menu.