Someone made a highway tools helper jar that i think you should implement into the original plugin
This is the github repo: https://github.com/Doogie13/HighwayHelper (it no longer works in newer lambda versions)
This adds a netherrack eject and an empty shulker eject module
Also it would be nice if you added some feature that allows two people to effectively mine a highway tunnel at the same time
Someone made a highway tools helper jar that i think you should implement into the original plugin
This is the github repo: https://github.com/Doogie13/HighwayHelper (it no longer works in newer lambda versions)
This adds a netherrack eject and an empty shulker eject module
Also it would be nice if you added some feature that allows two people to effectively mine a highway tunnel at the same time