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Shearwalls implements only Clause (a) of NBC 4.1.7.9.(1) Full and Partial WInd Loading, the case of full loading along each axis independently.
The torsional cases (b) and (d) require 100% and 50% respectively to be removed from "any portion of the area". The computational demands and increased program complexity of sampling a reasonable number of such areas would be prohibitive.
Clauses (c) and (d) require 75% of wind loads applied on both axes simultaneously. This procedure would apply primarily to elements such as columns designed for combined loading. These elements do not exist in the Shearwalls program.