Jörg Knappen wrote on Mon, Aug 1, 2011 12:00 PM UTC:
Charles, after all, you are the game designer and it is your decision (after, I hope, some playtesting) what design you want to implement.
With the King being able to cross the channel, additional rules may be not necessary, but it is worth to think about game endings and how to judge them in any game design.
Adding new methods of capture (like overtaking [2/3] and approach capture [4/5]) to the dragons is certainly a good idea, you may also consider igui capture (killing a piece on a adjacent square without moving).
This will correct the balance of pieces protecting another piece over the channel on the ferry from 1:3 (Queen vs. Queen and 2 Rooks) to 3:5 (Queen and 2 Dragons vs. Queen, 2 Dragons, and 2 Rooks)---a balance I'd consider still very unbalanced, since Wales can try to sharpen it by exchanging Queens and Dragons.