Similar to PKHeX's batch editor, probably with some stubbed functionality.
Example to change Oak Trees to apple trees:
=ItemId=60000
.ItemId=60001
;
=ExtensionItemId=60000
.ExtensionItemId=60001
Example to unbury all items:
=IsBuried=True
.IsBuried=False
.IsDropped=True
hold ctrl+alt(+shift for full map) to replace all items on the map that you tap, with the item from the editor.
don't mix & match field items (trees) with regular items, cuz we can't verify size matching for those. Field Items return "unknown size".
Setting a field item with the snap active will align it to the major gridlines. This will prevent the user from setting un-interactable objects (rocks, trees) unintentionally.
Having the auto-handle extension tiles will now delete all associated tiles when issuing a delete command on an extension tile, rather than just deleting the extension tile.