You are assuming that the calibration of the AS dial is equivalent to the grams you are tracking at. Do you really think that setting the AS dial to 2 means that 2 grams of lateral force is being applied?
I am giving the tonearm manufacturers credit for understanding a little about setting their product correctly. Equating the numerical values of VTF and AS makes it easy for anybody to set AS.
That being said, I have no problem adjusting outside the numerical dial numbers.
The forum members here delve very deeply into things like this and may be more accurate than the manufacturer's instructions, but a rule-of-thumb is necessary which can be applied by the consumer,. whomever they be.
Bill