Your proposal sounded workable to me. I posed it to an EA rep in the official Tiger Woods forum and got this response:
"Absolutely possible, and something we thought about too. its just a far more complex solution. Our AI system isn't currently robust enough to support such a concept. It could be made to be, but again it would have been much more work and risk. Also the tour may still have had issues with simulating actual play of their golfers...even without arcs. It's a touchy area for sure."