Yea I figure with great timing and speed it may be doable with a 40" running vert. Has to be perfect though I bet.
I've done a reverse (harder than I thought), 180, a pump to my chest, two hand tomahawk. One time I almost landed a 360 back when i was a one foot jumper. I got up high enough but missed.
Also whatever this first dunk is called:
http://www.youtube.com/watch?v=IbMcCUb3V_MBack then I weighed 170-175 and my squat:bw ratio was 2.05. It was the highest I was getting in my life. I had just switched from SL to DL RVJ about 5 months before that. I was still getting up almost as high SL.
Since then I can't remember the last time I tried SL dunking lol. I also weigh 20-25lbs heavier, but my squat:bw ratio is ~2.2 now.