About the cover swipe actions, I don't know how it would work when vertical swipe is already in use with switching between apps and notifications screens. Maybe if changing screens was restricted to edge swipes only, but I don't know how it would be received by newbies. Last thing we want is Symbian kind of screen changing where change happens only after the swipe is finished (back in time they said it was designed like that on purpose, but resulted in endless scorn about Symbian being unable to have smooth transaction...).

Maybe swipe cover actions should be made a configurable option...