I'd have to disagree. The 950 can provide a crossover as low as 40 hz on the digital side. If the little switch is set to 'no crossover' then there should be no crossover, period.

It defeats the purpose of having a set of 'purist' analog inputs if they monkey around with the signal anyway.

How tough could it be to set or clear a bit somewhere to turn the summing off or on?

Just my opinion, YMMV.