I'd really prefer being able to load into your ship interior during construction and marking ladder or door points that way, but having the ability to do it from the exterior view would be handy too. I'd assume the ability to move facilities within a hab would also be extremely useful so you didn't have to choose between losing a workbench or putting a door where you want it.

It's just difficult to imagine what it's like walking through your ship and just how far it feels to walk certain distances.