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Period for Computing Drift
The program does not implement 12.8.8.2, which allows the upper limit on the period to be ignored for the purposes of deflection design. This would have only come into effect if you wanted to use a period significantly greater than the approximate period from Table 12.8-2 for shear design, but not for deflection.
P-Delta Effects
As Shearwalls does not currently include full gravity loading, it does not include P-Delta effects from ASCE 7 12.8-7. It is the responsibility of the designer to check the stability condition q. This will be considered for the planned combined lateral-gravity version of WoodWorks.
Diaphragm Deflection
For flexible diaphragms,the program does not include the difference in deflections of the diaphragm at the top and bottom of the story, that is, that portion of the diaphragm between shear lines that deflects relative to the shear lines.