While working in the editor I am unable to scroll the editor between pages when i have multiple screens set. This issue is specifically in the editor not the live wallpaper. Live wallpaper scroll correctly. Also when i chose for example 3 screens in my launcher and set the sceen count in editor to x1 y3 the littlescreen/display icon show 1x2 not 1x3. At this point when i edit the different sceens i just overlap the features and save to see how it looks live and go back to correct anything. it is very tedious.
x1y3 means 3 VERTICAL and one HORIZONTAL, are you sure its what you are looking for?