Agreed, yuna does need help!
I'd also change the sphere grid system so that Kimhari (or however you spell it) doesn't end up so damn useless!!!
actually i would consider taking out the whole sphere grid, or change it somewhat
I would also get rid of all the crests and sigils and make the hp and damage break over 9999 from the start of the game
and I would have a world map mode. I miss the world map mode