i think there is a need for an other type of stockpiles
a smaler one which need only one space, maybe expandable.
a a bigger one with seperated in and out-lines, so you can put it between a station and an importer. station than have to order from the stockpile.
a 1x3 tile stockpile with seperated in- and outline also expendable.
it would be great if you think about it.