To my way of thinking, going to the 10-18 format is a bad idea. I love the Masters, but it is beginning to lose a little of it's aura for me. The 10-18 idea is okay for a regular event, but not for a major.
The best way to resolve a tie is to play a 4 hole cumulative playoff, beginning at 10 and concluding with the great 13th. (if still tied after 13, go to sudden death starting at 14 and play in) The 4 hole playoff would guarantee that all the Amen Corner holes would get highlighted once again, and also give a man a chance to gamble at 12 and 13 if he fell behind early.
To do this, they could move the Sunday times up an hour or two. (they should move the times up anyway, in case there is a weather delay on Sunday)