You can combine the menu's in the modeller, which is a manual proces.
You can create a homeform with buttons that opens the application.
It is not supported automatically in Mendix.
Hi Akira,
You can easily build a startpage by creating a form with just microflow triggers. These microflow triggers should redirect your users to the right forms. If you have css skills, you can easily style these microflow triggers to fancy and nice buttons.