Or, maybe you could do something like the Xolah board does. Not delete these off topic and disturbing things (if your so dead set against it) but move them to "the basement" which you could label the riff-raff room; or the shit-hole; or the wayward home for fucked up buggers - something like that.
Hmm.. so you'd have all of these posts thrown in there, and the thread left behind and potentially full of holes..so i see it like you'd either have to arbitrarily move the entire thread to the basement or move nothing at all... i dunno..
(In re: to the other thing), in mozilla i can at least block anyways annoying avatars and/or signature content..
I'd like a bit of instruction on how to block annoying avatars - that too, is at times a problem.
As to the basement solution - it doesn't seem to hurt the flow of the threads. You'd have to label the posts you move - but that should be easy enough: porn and sadism; or, genitals; what ever. . .
Sometimes, on the board I speak of, they do move the whole thread, when it is mostly trolling crap. Everybody on that board knows if they cross a line, the post will end up in the basement. Its fair enough I think. Its still there - people can still respond - but its in the basement. It is just a suggestion. I do think something needs to be done. I hate not having any kind of solution to the problem of off topic and grotesque images.
If it were up to me - that shit would vanish, never to be seen again, and the poster of it banished. I thought the basement solution might be more tolerable to Ginger's non-moderated sensibilities. It is a kind of moderating - but maybe not to the point she couldn't live with it.
Besides being un-happy with having been subjected to sights I'd really never want to see - How can I (or anyone) suggest some poor programmed parent take a look at Fornits for the other side of the story; knowing they would run across this extremely offensive stuff? It makes the board useless.
On the other hand, if we could say - look - check out fornits if you want to see some thoughtful debate on these issues - but be warned - stay out of the basement - that might work.