Great question and one that I have been struggling with for some time. I try to train as much as possible with my 590s under whatever simulated stress I can conjure up at a range or a course. Under the stress that exists at a course, I see quite a bit of user-induced failures resulting from short-pumping the gun - I have had my share, and while they are much fewer now, it can still happen.
I cannot imagine a larger adrenaline dump that one would experience than when they are woken up in the middle of the night by the sound of a entrance door/window being taken downstairs, with you and your wife upstairs in your masterbedroom, your son and daughter in their two bedrooms across the hall, your shotgun in the closet, either in a LocBox of some sort or not. Grabbing the children, getting them secured in a pre-set far corner of the master bedroom, taking up a defensive position across the hall of the masterbedroom at the top of stairwell, and then having to fire repeatedly when a bad guy or guys turns the 180 degrees near the top of the staircase, enters the fatal funnel, and attempts to rush the remaining stairs to the 2d floor. Will I have enough muscle memory to work that pump as perfectly as I must? Can I manoeuver it effectively within the confines of my hallways?
Under range/course stress, the 930SPX works like the ARs I'm familiar with, that is, I don't have to think about the unnatural act of pumping between rounds. I am working the autoloader into my training in order to get a few thousand rounds through it. I have had no failures since fixing a minor factory assembly defect. If that continues, I am going to seriously consider the SPX as the HD gun.
Be that all as it may, my Glock 17 with dedicated Surefire X300 is always with me in the house and right at the nightstand when I sleep. I have it with me in my practiced HD scenario above (
SafePacker by The Wilderness works quickly and perfectly with PJs) and will have it with me in a real event, and long before I get to the shotgun, however.
Apologies for such a long post and only my second at that, but this is really a great question and one I know I must work out for me and my family solidly and soon.