I tried to do this as well, but since you can't map an axis to the zoom it doesn't really work. By banding the rotaries you can fake it awkwardly, but it becomes hard to control. If zoom could be controlled by an axis, or if you could set buttons to individual zoom levels then it would be trivial.
(Re. x52: there's a mouse wheel on the throttle, next to the hat, which is a good match for sensor and map zooms.)