First phase of Game Center integration is almost ready, and scores can be saved in the Leader board (Yes, only one leaderboard will be used for simplicity). After a match, the player will get a score based on some factors. 4 categories will be considered, and the balanced values will contribute to a final score. Because the nature of two game modes (Commander, Admiral) differs, the maximum score that can be achieved will differ in two modes. Also, the players of the two modes will not be separated, there will be a single Leader board.
Newbies can accommodate first with Commander mode, meanwhile the score is recorded, and after switching to Admiral mode, can increase the score faster (Admiral mode will result in higher scores and bonus points). In few weeks this feature will be released for iPhone.