Sam,
Just so you know. One of the guys who wrote the program has already responded in this thread.
RED ALERT was designed as a quick application to view and perform onelights on r3d files and that is what it does best. It's not supposed to be your final color correction tool.
I am not sure what you are trying to calibrate but there are better things to consider than the zebra's in RED ALERT. Testing, histograms, false color, and the many tools available on the camera is a much better way to figure out exposure on the RED ONE.
Check out my article on exposing for RED right here on the cow.
David
Peace and Love :)
Read my Blog
http://blogs.creativecow.net/DavidBattistella 
