Let's overhaul smart belt!

[mmmPI]

you need a key for "force smart belt" maybe ? do not attempt to underground those unless shift is pressed when dragging, then i expect the smart belt to try and make the undergound at the max lengh, possibly removing the yellow belts in the process, but it should stop at the splitter and not jump over nor remove it. Continuing to drag should place a underground entrance right after the splitter and resume mentionned behavior

( from someone who doesn't use smart belt a lot because i don't lke it "yet )

[pantabo1]

130603

i think this post from anti might be relevant