I want Sentinel Island to be rather important piece of territory. While its location may not make it strategically important, it is heavily tied up with draconic magic and, of course, its the place where Maxos built his Battle Tower. Controlling it should therefore be hugely symbolic and influence relations with your rival Dragon Knights. Or it could be considered neutral ground in the conflict. Just so long as it's an important bit of the map.
I also wouldn't mind learning more about Sentinal Island itself - maybe even have her walk around on your battleship if certain requirements are met.
Oh, and I'd like the option to play as a female Dragon Knight.