bigger real estate. So there is really no limitation in the current light circle to accommodate that "bigger" for more space in between photosites to have lower noise or more points.
I think the sensors are not made by Olympus, but if there is a good reason, it probably can request the manufacturer to do it.
Just trying to understand, why do you want it to increase by 2 pixel?
I think the Sensor shift for high res photos work, but I seldom used it.