If I was to megasquirt my car and get one of the vgt Id set it where I can select between say 4 different angles. Getting the software/programs to have it continually adjusting taking in factors of TP, RPM, boost levels, temp, etc, etc would be a nightmare.... just way to many variables.
With say 4 positions you could either set it up for whatever type of driving youd like, quick boost for driving windy roads or high boost at high rpm for drag racing, etc. Or you could some how set it up so it adjusts at certain RPM increments.