Can we please have a toggle for the effect that occurs when placing Resource conveyor sections? (The toggle could simply be clicking the Resource Conveyor in the Slot dialog - click the Conveyor, see where conveyors are currently placed).
It would be useful to be able to see the current placement without having to (pretend to) start placing them.
Input and Output stockpiles on slots (especially Make slots) could be slightly different shades to distinguish them.
A further enhancement would be to show the utilisation of conveyor segments using colour (e.g. Red = constant usage, white = no usage, green = medium).
For extra credit the idea of clicking a Slot type in the popup could be extended to highlight all slots the same types already placed? (and/or related types i.e. click Paint => highlight Paint Undercoat, Dry Undercoat, etc)
Note: I’m spending far too much time playing this game