Scenario Editor: Rotating a terrain tile?

[DeathMutant]

Most terrain tiles are symmetrical so rotating an individual tile is meaningless. Some tiles, however, are asymmetrical -- like a Port -- and it always "points" west; there is open water on the west hex side and land on all of the others. Is there a way to rotate an individual tile so that it "points" a different direction? I have seen port tiles rotated in maps created by the random scenario generator so was thinking that it must be possible -- even I had to manually update the MAP file with a hex editor.

[DeathMutant]

UPDATE: Ports appear to be aligned based on the (blue) Port Entrance lines that you can draw on the map. The alignment of airfields and urban areas does not matter except for aesthetic reasons.