Sounds like fun being a test pilot. I dont recall reading about that technique in the POH.
You'll be lifting off near Vs and pulling up the gear not long after. I hope you dont experience any windsheer in the transition or you'll end up back on the runway with gear in transit (or up).
I'd love to explain that to the insurance company.
Remember most books takeoff safety speeds are based on 1.2 Vs with flaps up. Lifting off at a slower speed means you are reducing all margins of safety. If you approach the runway at just above Vs you will use less runway. Not very smart though.
With the above technique, what is the distance taken to climb over a 50ft obsticle? Not much different than the technique in the book I'd suspect.
Bevan..