Screen Feature Request

Greeting Screeners,

Please forgive me if this is a duplicate feature request. I searched the 
screen mailing list but did not find this feature. I'm running screen 
version 4.05.00 (latest version from the Debian 9 stock repos).  Perhaps 
the following feature has been added to a more recent version of screen.

-------- Feature Request -----------
I would like to request a key binding to navigate focus to the previous 
region in split screen mode.  Currently I can use CTRL-a TAB to navigate 
to the next region.  But there does not seem to be a way to change focus 
to the previous region.
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Best Regards

-- John
http://haverlack.net