Would it be possible to have GSA envelope a combination following a convex hull approach rather than get just max / minimum effects. The user would select any two of the load effects (most likely fx and myy or fz and mx) and the results would be the points which define the perimeter of all the permutations in the envelope.
Each result point would have the other coexisting effects also output to assist with calculation.
The results would simplify ADSEC NM checks and also cover the cases where the worst case is not a maximum or minimum of one effect but a combination of two effects.