That tick box is not available for all carriers....only UPS by Shipstation, I believe. Additional Handling Surcharge (AHS) is automatically calculated for actual weight, length and width, but it is NOT automatically calculated for "non-standard packaging." Allowing custom packaging types to be designated (with a tick box) when they are non-standard packaging would be a very easy solution to make sure that live rates for the non-standard packaging AHS are included in the rate quoting.
