The way I read it and how I think Dan looks at it is you can run anything beyond .050. So on a LS-6 cam if the the cam runs 242 degrees at .050 you can make it lift as fast as possible after that. Let the lobe slam the valve down as quickly as possible at the back side of .050 measuremant but to end up with 242. Again what ever is under the curve is above the .050 mark is legal.
Use your imagination if you want. You could run a launcher lobe just like the circle track guys that have lift rules. After the cam runs a certain RPM the lifter jumps the lobe to be caught on the back side of the ramp. You could run a cam .035 bigger than what is leagel and also run a duration that could never be measured by standard rules. All you would need to run is spring pressure and piston clearance that would allow clearance
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JIM