Deleted off-topic posts. Please stay on topic about the suggestion for consideration with valid points. Thank you.
I like this, especially for exploring new areas, especially if you’re going in a straight line. Click four times, wait, click four more times, wait, place light, repeat, gets old quickly. (I’m still here, so obviously not too quickly.)
If I fall, I know the exit is up, and use torches until I’m back in a tunnel.
Perhaps make it degrade with use.
Much as I like the idea of a map that will let a BH plan a route through dark areas, it’s not necessary. Going up will always reach the surface. Even if you haven’t explored that area yet, you probably know which direction to go. Do, however, always carry extra food!