Mobile menu animation

Hi – currently trying to modify / insert a script to animate the menu to slide in on mobile if anybody has any ideas or wants to help out developing let me know – we can pay. I know this is an older plugin – but no other plugin works as great for styling big mega menus that automatically adjust for a quick mobile touch menu. Currently the aria (angled V) in the mobile menu does this interesting 180 flip. Can the Li item be animated to slide down? just trying to breath some life into this thing. Check out this fiddle for responsive navigation using CSS – it is based around a css button. http://jsfiddle.net/kmturley/88HRF/ The mobile mega menu triggers using javascript – perhaps we can insert a small code in the custom tab of the menu theme editor on the back end?