Highlight Route

A nice-to-have would be a hotkey/command to highlight everything feeding a building or conveyor. For example, if I click on a downstream building, this command will dim the rest of the map, making selected route's conveyors and buildings along the route glow to show everything back to the Extractor. This can easily show the path and possible bottlenecks for the route if there are a lot of parallel conveyors.

I have an engineering tool at work that does this and it's a huge timesaver. With a packed map, it'd be tough to manually backtrack to find out where to improve.