these things! they can be seen on the map, so I figure it would make sense to have a non-map view of them that can be toggled just like grid lines and room borders.
doors aren't usually far apart, but this could help a lot when rooms have to be put farther away, when there's odd door alignment shenanigans going on, and honestly, it would help a lot just for understanding at a glance how your rooms connect, and identifying any doorways that shouldn't be there. it would also help makers identify if a door connection has been severed somehow, since that can often happen when moving or copying doors.