So Using this Slice is a very helpful tool for either storing stuff underground or just making a safe room for your townies.
An idea that will be useful Is to make a save able height so for example being able to save 5 different heights.
Why it will be good? :
if you mine underground for stone and not in a mountain you go pretty deep , you wont store your items there cause its a long way but would be easy to access your mine.
easy to access the storage which sometimes is placed in different heights underground and up in the mountains.
just an overall helpful feature to make slice feature easier and better .
Thanks for reading.