There are some things that probably could be added to the spam filter that would make all our lives much easier, but I don't know how much you can just pile onto it for frivolous auto-assist purposes rather than conserve resources for any more illegal or ad spam shit that comes in the future.

Board-specific block/spam filters would be another pie in the sky idea, to deal with local problems without putting on needless site wide burdens, but I don't know if that is a feasible option or not dev-wise. I remember, a while back, there were attempts to auto-filter block some basic shitposting/flaming tactics on /v/ so I think it is possible, although I'm not implying anything remotely as heavy-handed as that.