Factory pathing and other features

I am currently struggling with my factory. Not all inputs are picking up their items even though I have about 10000 in stock. I see there is a pathing issue, so that might be it. Can we set the path for workers to take like we can set a shop queue?

Then a few other factory suggestions:

  1. Splitter.
    An item that allows us to split items from the conveyor belt. E.g. expensive gems go left and cheap gems go right and straight.
  2. Cross.
    A way of allowing conveyor belt paths to cross. E.g. the metal bands go over top and the gems go underneath.
  3. Bridge
    A way to allow workers to cross a conveyor belt.
  4. Half length conveyer belts.
    To help us use that unused space.