@madmole First, I love love love the new inventory sort buttons ... although I'm an old dog and I am having difficulty teaching myself to stop clicking the little backpack icon to sort. LOL
Suggestion ... can the smart stash button add all similar items ... not just all similar items until the stack is filled up? Or can another button be made that will stash all of an item if there's at least one of that item, creating new stacks as needed? For instance, if your storage bin has a partial stack of stone, and your backpack has ten stacks of stone, the smart fill will only take the stone out of your backpack to make one full stack in the storage container. You need to manually move all the other stacks of stone.
I don't know if that makes sense?