nope, U2412m can only natively stretch and Software can only stretch and/or bars.
hmmm...one more thing, how do you want to make 1080p (16:9) to put in 1200p (16:10) without stretching or bars? You know you still have to do something with those extra pixels.
If U2412M could support 1-to-1 for 1080p, you will see bars!