Feature Request: Keys to set focus to window in zone

[teigl]

Ability to set focus to window in a specific zone. I.e. when pressing + the focus is set to one of the windows in that zone.
If the current focus is on a window that is not in the requested zone, focus is given to the window that last had focus in that zone.
If the current focus is on a window that is already in the requested zone, focus is given to the next window in the "focus stack".
Hope this makes sense.

Great app btw!