This is currently not possible with config settings, but you can do it in the code by changing 3 lines
In BasketBLL, line 1715 or thereabout, change
ShippingPrice.TaxRate = IIf(ApplyTax, .ComputedTaxRate, 0)
to
ShippingPrice.TaxRate = 0
In KartrisClasses.vb, in two of the Public Sub New, change
numShippingTaxRate = ShippingCountry.ComputedTaxRate
to
numShippingTaxRate = 0
This will leave your ITEM tax intact, and just remove the SHIPPING tax.