Are you not referring to the flash-sync speed preventing the flash from being available? The flash cannot be used with shutter speeds faster than 200th/sec, and there is absolutely no way around this at all. So to get the flash to fire you could use shutter-priority mode set to 200th/sec so the camera will adjust the other settings for correct exposure but will definitely use the flash if it is popped-up, you just gotta watch motion blur with fast moving subjects.
Or you have to find other ways of achieving a similar effect, like using the Photoshop eraser to reveal a +2ev layer behind your primary layer; which has worked very well for me in a few shots. Another idea is these continuous LED lights for DSLR's which might help me with skateboarding photography; but looks a bit overkill for most situations.
I was a bit shocked when I first realised this limit; but it's not the end of the world. Hope that helps.