Traitor/mods/vents/settingtypes.txt

# Enable free tube placement with no level limitation.
# If disabled, connected stations have to be on one level,
# typically underground.
vent_free_tube_placement_enabled (free tube placement enabled) bool false

# The ticket block has an additional field for specifying a subnet name.
# Stations with the same subnet name (optional) represent an isolated
# subnet within the vent network.
vent_subnet_enabled (enable building of subnets) bool true