more natural way to pick window?

[Duoying Ji <duoyingji gmail com>]

The hot corner at left-up screen is not very natural, although Win-key provides another way, but it's not suitable for mouse-centered workflows. Could we use up-edge of screen to trigger overlay, then easily to pick window, it's easy to trigger, especially for multi-moniter situation which could be triggered on each monitor without moving mouse a mile away, will it be more natural? The possible drawback is wrong triggers by mouse reaching up-edge, but it seems they could be filtered by an small resident time of mouse.

Is it possible to create a gnome3 extension to implement such function?