Maybe it just slipped their mind or they didn't consider so many monitors actually don't support the non-standard 57Hz. It's certainly doable (as discussed in the hardware section), they just need to release another firmware update.
i REALLY HOPE SO!
I'm currently on my 4th set of 3x 24" monitor trying to find the perfect set for 1050 triplehead gaming.
Set #1: 24" Acers just see if my system can support 3x 24"LCD
ser #2: Soyo. feels cheap and fugly monitors but display picture is nice
set #3: Dell e248wfp. image quality want to make me puke
set #4: BenQ G2400WD great monitor but it crap out on 57hz :( might be keeping. I hope matrox do that firmware as I want to keep these. nice picture for price, HDM/DVI/VGA, fast response time and no input lag.