More control over pipes. Similar results as Flow Control, but with the GUI and hotkeys of Inserter Configuration instead of unique items per bend. Run pipes with different fluids next to each other!
Providing the player with new tools or adjusting the game interface, without fundamentally changing gameplay.
I'm occasionally getting the above error in a save with 2 other players. I'm having trouble reproducing it reliably, it has happened when clicking any button on the flow config UI of a pipe (real, ghost, remote view, underground from AUP).
The only thing I can think of is we might have had multiple players configuring pipes at the same time?
Next time it happens I'll grab a save and see if I can isolate it.