Fudging the rules, I don't agree with.
Island greens should have the same OB rules as any other hole. I would always think that any island hole should have a significantly easier drop zone.
I'll try tonight to post a pic of my latest island green that is going to be #18 on the new course being built. I had the rare chance that I got to decide the size of the island and how it is built. It's liver shaped and it's sloped from back to front so that you could possibly run a disc off the water up onto the island. The back side of the island slope up and we are going to make a rock wall around the whole island, but the rocks will be high enough to keep shots on the island.
3 sets of tees...the long tee will be elevated and only about 230, the red(short) tee is only about 110 feet.
Rick its gonna be a COVER SHOT!