I have used some devices those have Multiwindow feature, I think that could be good to have a simple switch at Screen1 attributes to select to add a meta to say the apk could have multiwindow support.
at the AndroidManuifest.xml:
Obviously first we need to see how an compiled apk will react in this situation.
Maybe we’ll need a thing like the Orientation.change event to generate a way to do some adjusts dynamically when a window have its aspect changed.
To Android N and higher, we need to use multi-window API.