Foreground and Background Layers
Currently working on GUI-simulations.
And I think of two features that would come in handy"
1 Mark layers as 'Comp Duration', to make sure that these layers will adjust to the Comp duration, even when this is changed (great for Background-layers).
2 Mark layers as 'Always On Top', to prevent from arranging layers all the time: E.g. in a GUI-simulation the Mouse Pointer must be always on top.