If you look in SDK, you will see that all UILevel settings have a numeric value. For instance, Basic is set at 3, while No Cancel button is 32. So if you wanted to run /qb! = basic level with no cancel button, it would be a numeric value of 35... However, I tried that and it would not work.
So I did like some of the others have suggested and just create an MST and edited LaunchCondition to UILevel=3 from the default 2.
To install the msi with QB switch option change the condition "UILevel" in the table "LaunchCondition" from 2 to 3.
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