First off, thank you for creating this mod!
I've used it for years now and I enjoy the additional ambiance it brings to the game.
One thing I've always thought could be improved however, is that interiors of buildings often sound very similar to exteriors.
I currently have no knowledge of how the mod works, but would be happy to contribute with a little guidance. Is this something that you feel is achievable?

Best way is to provide situations of the engine not detecting things as it should. Use the command /ambient-debug and make a few screenshots of the surroundings. This helps a lot to see when things are going wrong.