I haven't expected that specific answer. But, still there is something more. First, YES, I forgot to note that I'm dealing with approximate methods of sway frame columns design. Please, tell me your opinion abuout that procedure SAP2000 performs using non-reduced stifnesses. Finally, I must agree with you.
Codes are too complicated.
Not only the huge number of possible load combinations, but two directions in 3D structure, could be a real nightmare. I'm not professionaly oriented to ACI, since I'm from Europe and we use EuroCodes. But, complains are the same. Your first question, why you need to split the moments into sway and non-sway when you perform a second order analysis from 10.13.4.1. I don't know.