is there a way to set it to use underground connections only? except for turns? this is nice and all, but sometimes the mod place's pipes next to already existing pipes and due to that it merges the line's, meaning i have to manually run the piping, how hard would it be to have it either prefer underground only, or maybe path 1 square away from existing pipes?

edit* ive got it set to prefer underground only, mixed mode set to 0.1, but i still end up with large sections of above ground piping that connects to other above ground piping,

It's definitely do-able, but recently I'm just too busy with daily works :<
When I have time I'll do it

Yes, when there are a lot of productions and lines, I thought I had bugs. yes, and there is the same problem with the pipes, it can be laid to the pipes, and there will be 2 types of liquid in them.