Hi,
I saw the new Varicam 35 which has got the features of green focus sqares. The squares become bigger, when the area gets in focus, they are small when the area is out of focus. It's just an other dislay of focus peaking with seems easier to identify the focus.
http://cinescopophilia.com/panasonic-varicam-ask-you-to-guess-what-these-green-squares-show/
I guess it's possible?
cheers Clemens