This idea is good, but pretty old. I know it's used in at least Wolfpack's version of the venerable Empire family: http://en.wikipedia.org/wiki/Empire_Classic_(

This idea is good, but pretty old. I know it's used in at least Wolfpack's version of the venerable Empire family: http://en.wikipedia.org/wiki/Empire_Classic_(video_game) http://en.wikipedia.org/wiki/Empire_Classic_(video_game)