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My understanding is Ford was originally going to make different height Gurney Flaps but for whatever reason didn't. I'm sure it can be done.
That's an interesting side note. They always have cool ideas that never make production.
I haven't had one apart, but I'm 100% sure it can be done too. The one on the OEM part looks well shy of the 1 to 2% height of the wing's chord length, since it's really a spoiler.
Looked on Fordparts and you can buy the stock one...says it's an 1/8 high.
I know trufiber makes a taller one. Could give this a try.
http://www.stage3motorsports.com/10025-LG93-2010-2013-Mustang-GT500-Carbon-Fiber-Gurney-Flap.html