This is a good idea

One issue with measure A however is that for A and F seats - or whichever the seats are by the fuselage - depending on where the window is in relation to the seat you either get more shoulder room (if your shoulders meet the window) or far less shoulder room (if your shoulders meet the 'join' in the interior cladding lid way between the windows)

As a broad bloke, the positioning on the window can make the difference between being able to sit straight or having to lean into the middle seat passenger, annoy them and get a bad back in the process!