After much experience with Panasonic BT monitors, I'm now digging into my new LM-2140, and I must say I am very impressed with the features and menu layout so far. But one surprising omission is the ability to flip an image both vertically and horizontally. This would be invaluable on set any time the camera is rigged upside down, including low steadicam work. I see that your smaller 9" monitor has this feature. Is there any chance you could add it to the rest of the lineup?
In order to support real-time image inversion the panel used inside of the monitor needs to support a reverse-write command. This is something that is rarely found in panels over 10" in size and the 21.5" panel used in the LM-2140W is no exception. This is why this feature is typically only found on small onboard monitors and rarely in larger monitors. We have image flip on the LM-0950W because the LCD panel natively supports it.