Underground belt can be placed directly on normal belt. Additionally, placing an underground belt will remove any normal belts facing the same direction between the end points (as in Quick UG).
Could the option be added to automatically extend the belt to the maximum distance and place the end point automatically? Or even if a splitter or turn happens place at the last same facing belt direction.
This would be for massive bus upgrades, where you are replacing 1000 of belts to increase UPS.
