SCS should approach the Australian Navy and see if they would be willing to underwrite additional development on the game. Indonesia has a demonstrated submarine threat, and the Aussie Navy is putting $$$ into ASW platforms and training. Before you laugh at the idea of a govt subsidizing a video game, note that Battlefront.com did this with Combat Mission: Afrika Korps. The Australian Government, Department of Defence licensed it to aid Officers in historical education.
http://www.battlefront.com/news_cmak.html