For continuous footings the concrete bending and shear demands are all derived from the finite element analysis results of the beam on elastic compression-only springs. So if the concrete combinations produce an unstable condition it can't give any results. Hence there is no option to ignore the concrete combos in continuous footing analysis.
Adding surcharge (and increasing soil allowable capacity) is probably the best way to eliminate overturning stability problems.
Adding surcharge (and increasing soil allowable capacity) is probably the best way to eliminate overturning stability problems.