So, it occurred to me that there is a small way to encourage use of the Roman Fort by the Legions. Currently, it is almost only worth using their build charges for a single harvest. What if whenever a Legion built a Roman Fort it could trigger a culture bomb and claim surrounding tiles? This makes sense from a historical point of view since the Romans used many forts to claim/control borders. It would be a nice little flavorful thing to have, in my opinion. It also encourages the player to make a bit more of a choice if they would rather get walls in that conquered city up fast with that build charge, or break off some nearby enemy territory with a Fort, for instance.