Changing God's mind.

This is a thought experiment that may require some to suspend disbelief.
Assuming there is a God, and discerning what you can of what aspects of "his" nature must be in play for the world/history/the universe/etc. to be like it is, what would you change about the nature of God if you could change any one aspect of it? (Please elaborate on what effect you think such a change would have on the world or on you personally).