multiple stockpile creation by area

[gravesmerch]

right click inventory item then select area to create multiple piles automagically

[NightMind]

Honestly, I'd take creating "ghost" stockpiles with 0 items. Useful for barter posts and whatnot, useful when you're sorting stuff, useful when you don't want to lose stockpile placement that you managed to make oh so tight. And the ghost piles are walkable so long as they have no items. (as opposed to Produce Bag piles)
visibility can be handled by a toggle, liek Adventure -> Toggles -> Show/Hide planned stockpiles

To place or remove, use alt modifier key or consider using a checkbox "don't remove stockpile when empty"