Changing players’ green height slider

What Feature would you like to see included within TaleSpire?
What does it look like, how does it work, how is it used. Paint us a figurative picture.
My players often complain when they explore vertically-layered maps because the green height slider automatically adjusts when they move via keyboard. Some of my players aren’t very technical or quick learners, so I’d like to be able to adjust the height slider either manually or with bookmarks. I would be able to set up a bookmark and have it save my current slider’s level. Then, when I call players to that bookmark, it sets their height sliders to the pre-set values (and maybe even locks it there).

What situations would this Feature be useful?
Descriptions, examples, interactions with existing features - whatever you can think of to get your idea across!

This would be useful for vertically-layered maps, and for players that have a hard time adjusting to new technology. I can remind my players of ways to circumvent this, but it just comes off as nagging; I’d instead like to be able to set their camera to a baseline when they get to certain parts of the map.

Additional Thoughts/Details