Excellent topic, y'all.
There is a small section in our manual (swept-wing, twin-turbofan) which claims that in some severe turbulence situations, it might be best to not just engage the autopilot, but switch one of the knobs to pitch hold, in order to avoid chasing airspeed by moving the yoke forwards and back.
I've never read anything else about this 'pitch hold', nor seen other (captains years ago) pilots use it, nor seen it discussed in any systems review or sim briefing etc. Of course (I) we've never been in any turbulence worse than 'strong' moderate
, fortunately. I would rather be in a bit of moderate for a short while than have these damned computerized systems tests in the future
.