Tiggzi makes app development simpler in many ways. Building the mobile UI with jQuery Mobile components via drag and drop, defining REST services, mapping REST services, testing and much more. However, there are some things you will need to code yourself. Adding a 3rd party JavaScript widget is one of those things.
You first add the JavaScript files for the widgets. You would then attached the component to some div in your app. The Mobiscroll examples shows exactly this case.