When hints are enabled add a dictionary word look up function maybe including anagram finder. Often when I'm playing I think of other words that can't be spelled with the current tile set. This would allow the player to see if they are legal or what other combination's might be possible. I think this would be a good way to improve on your game by expanding your personal word list and also serve as a good dictionary when playing the boardgame.
BTW, this game is awesome, it has been a life saver on long trips.
Thanks,
csald9999@yahoo.com