Currently when Switcheroo overlay is displayed, the top window in the list (and the one that's focused by default) is exactly the same window that has just been focused. This default makes no sense: if user wants to switch to another window, he'll select a different window in some way, and if user wants to close the current window, he or she will just hit Alt+F4 without invoking Switcheroo.

However, if the current window is moved to the bottom of the list, the top item will be the previous window. Which exactly matches the behavior of Alt+Tab. This way switching to the previous window could be done simply by Alt+Space -> Enter and Alt+Tab wouldn't be needed anymore.