Don't have the time to go into really deep thoughts here, but will give a few thoughts and hopefully be able to expand on them later on.
First, my biggest concern would be reliability. With regular loads this shouldn't be too much of an issue, but with something like the mini shells I have seen them choke guns before so I'd want to vet the hell out of the gun I was using them with. I will also say, and this may not even apply to you, but I will mention it, I have also seen more than a few people cause malfs with shotguns, both pumps and autos because they don't shoot them enough, short stroking as well as just not holding a auto tight enough to cycle the action. Also I have found some auto loading shotguns to be a bit more finicky when left stored for a long while and then shot without lubing. Anecdotal, but worth mentioning since a lot of people buy a shotgun, or any gun really, shoot it a few times, load it up, stick it in the corner or the closet, let it set there for YEARS and expect it to work perfectly when they need it.
As far as bullpup shotguns, the KSG in particular, one of the things that could concern me with it being a pump, and I believe has been a slight issue, is when running the action the hand cycling it slipping and ending up in front of the muzzle. This is a concern that I have looking at them, and something that I would personally be considering. With the KSG as well, you have one tube, of 7 I believe, then you have to hit a lever with to change it over to the next. I'm not super convinced that it is something that is going to be natural unless you do train quite a bit to be able to do that, and it would be something I'd want to be able to do second nature since you might be doing that in the dark under a lot of stress.
Last point, not a huge fan of manual actions these days for HD, always have the thought that I might be responding to a threat in the back of my head and end up behind the eight ball and have to engage the threat after being wounded with one arm, a pump makes that a bit of a bitch. It is a thought. Also, for the sake of clarity, I don't run a shotgun for HD, have pistols and ARs. I do want to set up a 870 though, just for shits and giggles to play with though.
"I don't collect guns anymore, I stockpile weapons for ****ing war." Chuck P.
"Some days you eat the bacon, and other days the bacon eats you." SeriousStudent
"Don't complain when after killing scores of women and children in a mall, a group of well armed men who train to shoot people like you in the face show up to say hello." WillBrink
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