If I use FlashScan to compare my stock calibration against one I used LS1_Edit to disable CAGS (by setting the %TPS to disable to 1%), FlashScan doesn't seem to report any CAGS related differences although clearly there are. And the FlashScan D0401 (CARS/CAGS) page only lets you enable/disable the solenoid and dashboard lamp; I thought there are actual parameters you could tweak.
I also remember reading about folks who were working on a drag-CAGS config. Did that ever get anywhere?