I ended up having to use the resource mapping, easy enough. Typing:
…shows the current arrangement. Since I wanted to swap two motors into the same resource positions, I had to use an unused resource temporarily (github says you don’t need to, that you can ignore the errors and things will map upon “save”, but that didn’t prove true for me). So, I had this:
resource MOTOR 1 B08 resource MOTOR 2 B09
…and I needed to type this to swap them:
resource MOTOR 1 B10 resource MOTOR 2 B08 resource MOTOR 1 B09 save
Now, all motors are in the correct position, in the correct rotation. I’ve got a cam to wire, and an rx to bind.