Hi, I have two questions.

Is there a way to prioritize usage of underground belts? I'm using this mod for my main
belt and I like using underground belts as much as possible.

Currently it only places underground belts when there is an obstacle and it places them right next to the obstacle. I'd like for it to leave one tile of space around the obstacle.

Is there a way to configure these things?

Not yet - I wanted to get things working solidly with just the initial pathfinding mode, so there's no options yet. I definitely want to support different pathing strategies with some simple options, but I wasn't sure quite what that should look like - "prioritize underground" vs "prioritize above ground" as just a toggle, or will other people's use cases mean that'll quickly turn into a big options dialog?

Added an option to prioritize underground belts in 0.16.5.