Last night....
I tried turning a 2006 specialized hardrock frame in to a road bike/cross bike
I put a road fork in it, and the handle-ing was so poor. But on a straight sprint, it was flying. So it was basically like a tri-bike. Cornering poor, but fast. I disasembled it. Makes me wonder if theres a happy medium in between road fork and big-long-heavy mtb suspension fork.