Right, looks like I misunderstood what the option does. I had thought that enabling the option would automatically make cities work up to MAXIMUM_ACQUIRE_PLOT_DISTANCE. The Defines table is simply a sql table- it helps you pinpoint what part of the game code you want to look up/edit.
Anyway, what you'll actually be wanting to change is MAXIMUM_WORK_PLOT_DISTANCE to 5. You'll be able to find an entry in the CP folder's CoreDefines.sql, so you can edit it from there if you're not familiar with sql. You can also just write this in a sql file somewhere, assuming it loads after CP:
Code:
UPDATE Defines SET Value = '5' WHERE Name = 'MAXIMUM_WORK_PLOT_DISTANCE';