It's not the littering that bothers me, it's the inefficiency of have to go through the entire stocks screen to locate the items and unforbidding+(re)dumping entire categories rather than just single items (some of those items could be outside, miles away from the stockpile because their previous owner was eaten by bears). The ideal outcome would be to end up with a single, visible pile of forbidden loot under the DAS for easy manual sorting and disposal.
However, if there's a possible bug at work I'll go with the easier option. I'm sure I've used similar systems for trash compactors (flooding an underground refuse pile instead of a depot) without this issue, but I've never paid too much attention to that section of the stocks screen.
My suggestion would be to make either a one tile dump in the existing washout area that is under the existing DAS, or make another one tile dump very close to the washout area with its own DAS. This will pull the rubbish items out of the quantum flood masking state. It will still involve a large number of hauling jobs (unless DFHack autodump is used), but the short hauling distance will at least minimize the time drain impact.
Thanks. In my case the DAS is 1x6 (so 5 tiles of 'open space'), so this actually works pretty well. Everything that's hidden ends up either in the floodgates or under the DAS anyway They're only dumping the items 1 square or less so it's pretty swift.
....no need to kill them, that results in unwanted ghosts sometimes.
They're loyal servants of the bourgeois dwavern elites, that's reason enough to kill them (plus, this way I can also use it to dispose of any tall vermin who visit). All those dead pack animals are a good source of food, ammo, and leather too.
That damn liaison is next: I'm thinking a glass box. Put in some nice furniture, a years supply of food and drink, and some random weapons. Seal the mayor in there with the liaison until he hopefully goes berserk. If the mayor survives, I'll let him out and the fort will pay attention to his mandates\demands for a year, if he loses; keep adding badgers and see how long the liaison lasts.
Either way, it should make the dining area more interesting.