modding map hexes in Modern Campaigns?

[neonlicht]

Been experimenting with custom-scenario design in the JT Modern Campaigns series. On one of the maps that ship with the game I noticed some anomalies---for example, a small fragment of "primary road" in a Danube water hex (only visible in 3D mode). And that made me wonder: is it possible to edit individual hexes in order to correct any anomalies? Thanks in advance for replies.