Post rules you know of but haven’t ever had to do.
Scaling (haven’t seen the situation yet that needed it)
I've had Scaling come up indirectly in "Strangers in a Strange Land". If I remember it correctly, the German defenders have Scaling ability. They are holding a large multi-level stone building which the French Legionnaires must take. Near the end of the Scenario, when trying to take that building, the Germans are usually occupying the upper floors, while the French are flooding into the lower floors. As the French player, you would expect to encircle the Germans by blocking the stairwells. Not so, the Germans have Scaling ability, and therefore can trace a path to ground level, see A7.72, Upper Levels.