I'm not an expert on dynamic disks but if you install Windows onto one SSD then connect the other and go into disk management and convert both disks to dynamic disks you I think you can then create a spanned volume which will cover both disks. I don't think there is anything in Intel RST Option ROM to do it before you install Windows.
Although I honestly don't see the point. There will be no performance increase, you'll possibly lose TRIM support and the ability to access the data on another computer and if you get a serious error on the system which affects booting it'll likely be harder to rescue. SSD toolbox programs may also not be able to connect to the disk which may effect diagnostics / fw updates / manual TRIM. You could avoid all of this by just having 2 separate disks and managing the space yourself.
FWIW, SSD's in RAID-0 only yield a big performance increase on sequential reads and writes. Many people including myself have tried it and not noticed any performance increase because we don't run the specific workload which takes advantage of it. 4k read which is most responsible for the overall "snappy" feel of your system is not improved with RAID-0.
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