As you may already know, current behaviour for zooming forbids the ability to zoom while in the air. This is controlled by the 'zoomlock' variable (default value: 1 "must be on floor"), which was introduced to deter people from springing up in the air, quickly zooming, and guaranteeing a headshot with the very powerful secondary fire of the rifle.
Since its creation, there have been several complaints about this feature. Therefore, it is being opened up to public input.