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guys, it works like this in the code:
1. the MAF is used all the time in normal conditions ie. P0101, 102, 103 not set.
2. there is an option thats sets what the PCM uses for airflow if the MAF fails, it has a few different options: Zero, Speed Density or MAF Estimation. Usually this is set to Speed Density. MAF estimation is similar to Alpha-N style tuning.
3. it looks like the VE can be calibrated to be used during transients, but this isn't done in any cals i have seen. Possibly GM has never tested that code or never found a need for it.
A simple test would be to set your VE table to zero and see if the car still runs.
Hope that helps,
Chris...