If I had a Andriod dual screen handeld, I would play coop dx right away, but if I wanted to use the bottom screen for accessing extra stuff like the player list, chat, minimap, and the stars you've collected and not collected. And make it so that you can add multiple widgets and move them around and resize them. It will be a app and not a mod, and how to make it work is opening the main game on the top screen and opening the dual screen app and the app detects the coop dx game. In the main menu and pause menu the app will show nothing, and in game the app will show the widgets, that's it!