Real windows, real snapping
Drag a window by its bar and drop it on an edge for half the screen, a corner for a quarter, the top for full. RigDesk then asks what should sit in the other half. The same gestures work on the windows RigDesk draws itself and on ordinary Android apps — those go through the system's own freeform mode, and when the permission is missing RigDesk says so instead of pretending it worked.