Outside the editor, mouse-hovering on the processor shows the little green arrows pointing outside of the processor on the active I/O ports.
Could it be possible to manually set directions for these arrows (i.e., inside for input I/O ports, outside for output I/O ports, or bidirectional for generic I/O ports)?

I would like this feature as well. Also the ability to make the arrow red, green, or both since it is not obvious that the wire colors are preserved and isolated through a processor pin.

Implemented in 1.0.17